Brake Vibrations and a Surprising End
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- Опубліковано 29 вер 2024
- Walter, my 87 Porsche Carrera, showed hefty brake vibrations ever since I had removed suspensions and brakes during the big restoration two years ago.
Tenaciously, persistently the steering wheel and actually the entire car were shaking when braking him down from above 100 to maybe 60. The chase of this problem took me two years.
#porsche911 #classicporsche #restoration
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If you had just thrown parts at it and replaced all four rotors this problem solving would have been delayed, perhaps forever. I’m glad you approached this issue so methodically. Great video
Unless I’d have been wise enough to know that eBay parts are 💩
Always nice to watch your work. Replaced a few brake disks and wheel bearings om my cars, but never given the «measurements» much thougt. Learned a lot from this video of your problem solving over the last months 😀👍
Thanks, Halvard.
It’s really the hopeless problems that one can grow on.
(Easy to say that once the problem’s solved.)
Sorry Johannes, I did mean to say, great production and great music. Thank you for working so hard to create world class content - a real Friday evening treat to watch..
Thanks, Lester.
It’s an amazing thing for me to see how many guys out there enjoy my humble efforts.
Well done. I wish my garage have a lift and all those tools :)
Thanks, Neil.
The lift is a blessing!
Enjoyable watch, thankyou! How do you find the Twinbusche single post lift, other than hard on the head!!??
Hi Chris. Thanks!
The lift is a very good product. It allows to have unhindered access to the car from one side and you can even move around the car in the workshop when it’s on the lift. Little disadvantage: the fork builds rather high, so flat cars require attention to drive over it.
i saw you using a German product called "Dr xxxx" to encapsulate rost (you mentioned that it was recommended by a friend of yours), It gives a flexibel, paintable surface as I remember it. Now I can't find it in your videos and maybe I am a bit lazy so I just ask here: What is the name of that product?
Hey, that’s Owatrol. 😊
@@GreasyFingers LOL - I wonder where the "Dr thing2 came from :-) Thanks!
This episode was like a thriller that catching the murderer in the last seconds! Well done, Inspector Columbo!
😆😆😆😆
I love that feedback. The point is, you see: I was ready to release a film with a “heeeeeeelp” kind of ending. It was ready to be published when eventually the penny dropped.
Your vids bring a zen feeling to restoration. I'm also afflicted with the perfectionist bug. "Zen and the art of Porsche restoration"
Thanks, Scott.
Yes, that’s where a big part of the motivation is coming from.
Holy cow. That look of satisfaction on your face when you finally nailed the problem was priceless. But.... now I wonder how are we mortals ever to hope that a shop tech will run any similar to problem to ground like you did? More videos please at a 1x/wk pace minimum please :)
Thanks, mate.
This business is all about experience. I wasn’t aware about two things and that sent me in the wrong direction. 1/ Rear wheel issues can feel exactly as if they were front wheel issues. 2/ When you try to find out whether your disks are okay, measure run out AND thickness.
Great findings, cangrats to you, Johannes!
Thanks, Michael!
A lot of Porsche owners seem like they started off their addiction with BMWs. Did you ever have a BMW? Will we ever see any classic BMW content from you?
My dad worked for BMW for more than 20 years, so the emotional bonds are tight. I’ll certainly do an 02 project one day, but today, it’s not even on the horizon.
Wow that was some intense investigation work, you have the patience of a saint 😇
So glad you sorted it.
Love this channel
🚙💨✨
Thanks, Craig.
I didn’t always sound like a saint though. 😊
Your prudence in tracking down the specifics of this issue are impressive, certainly a labor of love. This is perhaps the one time my "to hell with it - I'll just replace all of the rotors and hubs" would have actually saved some time. However, certainly not as rewarding.
Thanks, mate.
To be honest, a little less groping in the dark would have been nice.
Really great to see the channel is growing nicely - it’s been a journey. Well done.
Should have used the title Bad Vibrations and opened the video with a really awful cover band version! Seriously though, tremendous work. I have Z discs on my driving car with pads from EBC. Over the last 2 years I have given them absolute hell. They have never shown signs of giving up on me. Inspite of LFB whilst chasing motorbikes through the forest of blackness. Lass dich blicken wenn es um aussprechen geht. I did send you my number. Servus Mike.
Looking forward, Inselaffe!
This by far the most German car channel there is and I love it 😁
There’s not much we’re really good in, but if there’s something, it’s probably cars.
And humour. 😆
Every time I watch a Greasy Fingers video I learn something new and obscure that other restoration cahnnels don't cover. Also I would love to learn more about your history in restoring cars, your shop, it's evolution and how the business is currently going. Maybe we'll see such a video in the future.
Thanks, Albert.
Yes, I guess it’s time to make a film about all this.
What a satisfying video to watch, thank you. I've never seen such a deep dive into brake (and hub/wheel-carrier) set-up on ANY car. Along with the one on geometry a few months ago, it makes one realise that very, very few cars of any substantial age are set up properly, and it's probably the reason that people are often disenchanted with their heroes when they drive them.
Good to see you remind people that rubber suspension bushes are NOT bearings, I've cringed watching people bolt them up with the suspension hanging.
ETA >> perhaps not something you'd want to do too often, but letting 911 owners who are thinking about paying you to set up their cars drive Walter might convince them.
Thanks a ton, mate.
In fact it’s a nail chewing experience to let someone drive Walter. The kid did the other day, still having increased blood pressure.
I enjoyed This episode very much
Glad you liked it, mate.
Excellent film, thank you sir! I went through similar headache a few years ago on my 911SC. Spent much time and money chasing an intermittent vibration only felt during hard braking from speed. After replacing many of the 'obvious' parts like you it turned out that one of the brake flex lines was starting to deteriorate internally and was acting like a valve!
Thanks, James.
Now, that sounds even more devilish than my problem!
7 viewers either can't find joy in someone else's accomplishment, or are still chasing their brake vibrations. Can't please everyone, I guess.
😆
That’s what the web’s teaching us.
Tenacity always pays 😅 It is good to see you again after so many months of absence, greasy finger !👍 François
Thanks, François. I recently worked on a Mercedes project with tight budget and schedule, so I decided not to waist any time with filming.
Love your content. Watched all to date from JG in NSW Australia.
Thanks, John.
It’s so cool to have this global audience. My son, whom you can see in the film, went to school in Townsville for two terms.
thank you for your explanation, that any vibration can come from rear wheels. That is exactely what I learnt on our last BMW. This car always had vibrations. First, I changed the front brakes, then the rear brakes. Less vibrations, but still too much. I changed all parts off the front axle. Less vibrations, but stil too much. And then, I changed the rear tires. That was the problem!
Thanks for commenting, mate.
These wheel vibrations are very annoying and very difficult to get rid of.
I’d rather take a rotten sill instead …
I had a similar problem - but after changing my wheel bearings, brakes and doing my hubs it turned out to be my rear tires being flattened out from standing for too long with little air :-)
Thanks for commenting.
Yeah, that’s the problem: too many things that can go wrong. ☺️
at 6.38: please search on line how to proper apply grease to a wheel bearing ... putting some grease on the external face is not enought .. and... greetings for your videos ... they are superb!!!
Hey mate. Thanks!
Just because I didn’t show it in the film, doesn’t mean that I haven’t filled it with grease, does it?
@@GreasyFingers Hi there! a part from the grease you put inside the hub I am thinking about packing the bearing in the proper way: mechanics are used to put a slab of grease in the palm of the hand and pressing on it the bearing in each point till you see the grease escaping on the opposite side.. in this way you are sure of greasing properly all rollers... avoiding they overheat... In my opinion it could be nice to show also this detail.. Anyway.. superb videos and good spirit 😊😊
A lot of guys ruin the wheel carriers by improper removal or installation of the bearing races. They get them in cocked. I always heated the outside and used the proper puller. On install I put the races in the freezer overnight and heated the wheel carrier. No problems . If they are cocked you will know when you try to adjust the wheel bearings. You won’t be able to get the play out with tightening down the nut so you can still move the washer with a screw driver. Once I replaced the carriers installed the bearing races the proper way. My wheel bearing adjustment problem went away. Good video.
Hi Rod. Thanks for commenting.
Yes, using the thermal effects is a very elegant way to change bearings. I don’t have a freezer in my workshop, but I heated the wheel carrier to about 150 degrees Celsius to support the process. That’s about the temperature that I can handle with my welding gloves.
Such an engineeringly excellent, amuzing and ultimately satisfying episode. I yearn for one of these cars but even with NZ$100,000+ to spend on a 911 3.2 Coupe, I'm starting to come to terms with not ever being able to afford a good one. They're stupid money in New Zealand, the UK cars are rusty and all the 911s in Japan are LHD. So I may just have to live vicariously through your excellent channel.
Thanks, mate!
I find the 60k€ (100kNZ$) class of cars difficult to buy, as people normally overestimate the quality of their cars.
The 80+ league is easy, because for that amount of money, simply everything needs to be very very good.
If had to buy a car, I’d go for a 40k one.
Please also note: the SC model is much more fun than people think.
@@GreasyFingers Thanks Johannes, I really appreciate the advice. =)
I admire your persistence and the 'Deutsche Gründlichkeit' that you show and put in action! An admirer, freundlichen gruessen als Holland.
Thanks, Han!
I wished solving the problem had required less Gründlichkeit. 😆
Please no more music
Refused. 😊
@@GreasyFingers LOL...no criticism but the music did play considerably louder then the narration which i found annoying enough that i had to turn it down each time.
@@bradcrossman5068 I’m sorry to hear that, Brad. I really liked the hard guitar cords at the point when the project suddenly turned to the rear axle.
@@GreasyFingers Sorry if it seemed i was criticizing the music. It was just the volume that seemed too loud in comparison with the narration. But if that was your intent, please carry on! Cheers!
@@bradcrossman5068 No worries, Brad. Didn’t understand it as critique. 😊
Wow Johannes, fixing this annoying vibration was certainly hard won. On my very first car, I suffered from a very similar vibration and it drove me crazy. After 2 years of changing everything under the sun, the culprit turned out to be a faulty tire. It seemed one or some of the internal cords had broken and this caused the tire to distort under load and speed. Congratulations on tracking down the the root cause - I am sure you were so happy.
Wow, Lester. The cross you carried sounds just like mine. And as always, in hindsight all was so plain to see!
Are you aware of the works of Dizzie Rascal? ....in particular "Bonkers "?
Basically yes.
Why are you asking?
Thank you for another great video Johannes! I must admit your multiple visits to the press for the rear wheel bearings gave me PTSD from work I just had to repeat three times last month on my rear suspension. Also, I hear you got a tour of my Aircooled shop when you were in Toronto...sorry I missed meeting you! Next time, Mike.
Thanks, Mike.
Yes, Rob told me about it. Spare part quality is increasingly an issue.
Definitely next time!
I'm in the middle of a complete rebuild of my 1977 911. I will surely measure my brake components and carrier runout. Thanks so much for the in depth investigation.
Fingers crossed for your project, Walter.
Unlike anybody else I love the 2.7.
What colour is yours?
“Let me show you the results with a metaphor”
😄😁😆 I love everything about your work, especially the writing.
Thanks, mate. Lot of thinking goes in it and thankfully, viewers are kind enough to not point me on inevitable mistakes.
I really love both of my 911SCs. I just gave my Targa to my son. Now I'm buying a 914 and I'm going to swap in a 911S engine and lighten it.
Very cool.
The SC are widely underestimated, torquey punch and revvy at the same time. Especially the 204 BHP version is a fantastic engine.
'Six tenth of a Millimeter, it's unbelievable' :)
It’s a lot!
EXTRAORDINARY patience, discipline and resolve here. I especially appreciate the wise words of advice on using a block of wood and a jack to preload the suspenion before tightening tp prevent early bushing failure. That's something I've read about and remembered once you brought it up but if not for your reminder, I might have overlooked this valuable suggestion. Bravo
Thanks a lot, Steve.
Glad you watched though it’s not an Alfa!
@@GreasyFingers I always learn much from your clips. We are appreciate your work
Is that Cearah coating just a clear or is it like a paint I’ve heard the name but I don’t know what it is?
Hi Sean.
In my case I used a semi-gloss clear, but it seams it’s available in many different shades.
It’s a basically a paint with a high durability resulting from micro-ceramic particles.
Ebay parts can be risky.....
Hell, yes. I’m cured.
Greasy Fingers is my favorite Channel … is just smooth, easy and cool …
I like his voice and his fine sense of humor.
Love your channel, and wait for more , just wanted to know, why you don't use impact tools?
Thanks, Barry. I have a battery impact tool which I use for wheel bolts.
The reason why I don’t use it more: this work is contemplation for me and I’m annoyed by the sound.
Es ist so schön zu segen, das mein Lieblingskanal wieder zurück ist. Wenn Sie jemals in Norwegen sind, serviere ich Ihnen kalte norwegishe bier. Ich hoffe das Sie mir entschuldigen kan, für meine schlechte Deusch kanst.
Es ist so schön (in perfektem Deutsch) zu lesen, dass Greasy Fingers jemandens Lieblingskanal ist!
I love this channel. Your attention to detail is something else. However, and I know this won’t be a problem for you, I have an issue with some of your English pronunciation!
Lathe - we pronounce this in English as laythe.
Also gauge is pronounced Gayge
I know this is nit-picking , but your precision and attention to detail needs a language update.
Mind you, your English is Viel besser as mein Deutsche is Scheisse!
Greetings from Ireland, your friend, Connor!
Thanks, Connor.
I’d much appreciate if more viewers would point me on such mistakes.
I sometimes ask Jethro about pronunciation, but don’t always want to get on his nerves.
@@GreasyFingers Personally I think your pronunciation adds to the charm of the channel, like Christian&Vera @LR time in fact I love to hear the German name of components etc. which often sounds lengthy for the short English equivalent. German OCD at its finest.... 🤔 😄 👍
I was in a similar situation with a 1964 Volvo 1800S restoration. First measurements showed a big throw out of over 0,2 mm if I remember correctly, clearly warped rotors. At the time it seemed that the discs were not available any more for early models so I went and pressed the bolts from the hubs to remove the disc, unfortunately causing the hubs to warp with the intention of having the rotors turned. I had the hubs turned on a lathe and the discs turned on a brake lathe. Luckily at that point a supplier informed that the reproduction discs were available and on this one the hubs are integral to the discs. Brakes are totally smooth. I still have the original hubs and discs in a box, maybe one day I will test what kind of throw out can be reached.
Thanks for commenting, Markus.
Based on the comments to this film you wouldn’t believe how many of us had problems of this kind.
The 1800S is a glorious car. Do you still own it?
@@GreasyFingers Yes I do, occasionally starting it in the garage and waiting for the summer
Great video as always!
Thanks, Henry.
Your perfectionism is mind blowing! How is Olivia doing, by the way? Thanks!
Perfection? Hmmmm. Its a matter of finding the cause. And the work plus the thought required to do so. Tenacious I would call Mr Fingers. A bloody fine engineer.
It’s kind of true what Mike says. I like being perfectionistic with nothing immediately on stake. Different game with the back to the wall.
Thanks for commenting, guys!
This is what I call automotive troubleshooting!
Thanks, mate.
I wished I could have found it earlier. In hindsight it took me embarrassingly long to figure it out. One is always wiser when it’s over.
The on the car brake lathe can address this issue. As an auto mechanic I enjoy using the machine and getting near perfect brake run out measurements.
Yeah, that would have helped A LOT with the front wheel part of the project.
I’m sure you’re aware the brand Hunger is leading in this domain. They’re located in Kaufering which is around the corner from my workshop’s location.
The point is, you see: if you’re trying to be a serious UA-camr, you can’t just go to the workshop next door and let them solve the problem.
@@GreasyFingers Good point and great channel, I really enjoy your stories.
I have an on the car brake lathe that I spent a lot of money on 30 years ago and I find it's great for resurfacing but it seems to amplify not remove any existing runout. :-(. Now for my daily drivers (not performance cars) I just buy very cheap rotors for most pad changes and it's always worked out so far.
Brilliant work! And excellent tip for any carthusiasts out there! Thanks for this sharing of good break debug.
I buy Zimmerman when possible, never had an issue with quality. Glad to see Walter healthy again. How is the 944?
Good to know!
Bad news about the 944 as much as the channel is concerned. Sold. 🥲
@@GreasyFingers It is OK, I had a 944 Turbo S Silver Rose and sold it for 911... so understandable.
@@GreasyFingers oh noooo!!
Cerakote looks unfinished - nice!
Thanks, Scott. Yes, I‘m going to use it a lot more in the future.
You did not grease the bearing correctly.
Yes, I’m a naughty boy!
Hahaha, great video as per usual, maniac channel indeed 😁
This was my favourite line from this video - delivered with complete sincerity.
Well done👍
this is the diary of a psychopath..
Thanks, LOVE the compliment!!
Persistence pays off!
Yeap!
Nice work, I have a similar problem with my 1970 911, but that is vibration when driving and braking... a job for the winter. You have inspired me!
Thanks, Paul. And all the best for your project!
I have similar problem from months on cayman S, tried so many things without solving.
I feel streess and sad but now your video really inspired me to do all my best and i will find the problem!
You send me so positivity and i don't know how thank you ❤
One of the best film i ever see, very emotional! You have new subscriber Thank you!
Hey, mate. Welcome to the channel and fingers crossed you find the problem of your car.
This (variation of thickness, or "ditches") in brake discs/rotors is something I've come across in the past. It can happen when the discs get overheated, and the brakes are held on while the discs cool off. Perhaps the car was tracked, and the driver didn't do a cool-down lap, for example, and sat for a while with the brakes applied.
Many moons ago, there was an anti-theft device that would go between the steering wheel and the brake pedal, making the car immobile. These would cause the same problem on some cars if it was fitted, and the brakes were still hot. Or even if the car was driven with a seized calliper.
Thanks for commenting, mate.
Yes, all good points that make a lot of sense. In my case, a misaligned rear wheel carrier destroyed the disks. I'm mentioning it towards the end of the film, but admittedly not very clearly.
Amazing tenacity shown while tracking down that left rear rotor source of the vibration. Thanks for documenting the steps thoroughly. Not only do I learn more about my Carrera, mechanically, but I also notice how well you’ve edited the video.
There was a brief glimpse of the next main character; a SC?
Thanks, Bob.
The SC is a customer car, I have done some footage, but I’m not sure I can make a proper GF-film of it.
Your video is so on point showing the tasks and obstructions you have to overcome to get something into almost as new condition. I got to learn throughout the years that replacing for new often does not solve the problem, even worse, it sometimes creates new ones. And sorting those out quite often sends you one a wrong path of diagnosis, as you initially never doubt the new, just replaced, components. So you find yourself barking at the wrong tree and then spend countless hours to encircle the issue.
Had that case with front drum breaks on a 62 beetle. After the third set of drums I removed the perfectly round & new Technomagnesio wheels and put the rather oval steel wheels on. Turned out, the way the wheel bolts load tension on the entity warps the drum even at a low 80Nm.
You’re hitting the nail to the head, Oliver.
We went through exactly the same thing.
Well, I admire your persistence. Amazing how these challenges with cars become all-consuming until solved!
Thanks, Julian! So right, all-consuming is the word.
It seems brake disc runout and thickness variation are very important! Good video, and I love seeing the process of eliminating factors of a complex problem. It helps to know there are others who are hunting for solutions for a long time.
Thanks Matthew.
I confirm there are others. 😆
Not that it matters much, because of the content of all of your films is so good, but I love your choice of music. I started watching for the Giulia. I mow enjoy the Porsche ones as well.
Thanks, Jim. Much appreciated.
It’s one of the things I love most about making films: selecting the song for it.
Loved the video! Time to look at the rest of your productions!
You don’t find the need to pack the bearings completely with grease?
Thank you, Nic & welcome.
I did pack the bearings with grease, just didn’t show it in the film.
well done for sticking with it. i'd probably have sold the car after the first year! :-)
Thanks, Bryn.
Solving this problem at some point became indispensable. Sort of a duty.
I enjoyed the video and happy for you that it is now solved. I was wondering if you would have been able to correct the initial disk on a lathe?
Cheers.
Thanks, Kyle.
Yes, I think I should do that. They deserve to be rehabilitated.
As a regular mechanic I would have changed the rotors first as almost 95%of brake vibration is due to rotor damage/warping
You’re quite right, mate.
May you only have Good Vibrations as per the Beach Boys. Glad Walter is fixed.
I love that song, mate.
Glad you remind me of playing it again …
Well done! Time for a well earned beer! “Failure is not an option, work the problem” Apollo 13
Thanks, Geoff.
I think I shall obey to that suggestion. ☺️
well done 🙌
Thanks, mate!
You do know that there are brake lathes that you mount on the car in place of the wheels, and they bring the runout to 0, right? 🤣🤣🤣🤣
Like Hunger you mean? I sure do. 🤣🤣🤣🤣
Great video… Nice work and good result! Enjoy driving Walter…
Thanks, mate!
Super video, I’m loving your almost obsessional attention to detail.😊
Thanks, Chris.
What you mean „almost“? 😆
Great work and as always a pleasure to watch 👌 Rear disc manufacturer Zimmermann as well?
Thanks, mate.
Yes, also Zimmermann.
Great video as always, this will save many Diy mechanics a lot of time, Well done!
Thanks, Geoffrey. 😊
That’s for sharing your video. Where is the front jack point to lift the car?
Welcome!
It’s not exactly a jack point, but if you protect it with a piece of wood or rubber, you can use the front cross member to lift her.
I was starting to lean toward a bad tire or perhaps wheel. Glad you found the culprit and Walter is now more sorted than before.
Thanks, James. 😊
I do hope you have ‘packed’ that bearing more than just some grease on the outside.
Sure thing!
Großartig! Tolle Fehlersuche, deren vermeintliche Behebung und am Ende eine überraschend einfache Lösung! Jedes neue Video hat für mich erste Priorität bei YT und ist dann auch noch ein Englischtraining - Danke dafür!
Danke vielmals!
Ja, es war irrsinnig herausfordernd und aufwändig, dieses Problem einzukreisen. Und jetzt muss ich vier Monate warten, bis er wieder raus darf! 😫
Quality never goes out of style or if you buy cheap you probably have to..... like tools
Yes, that is true.
Spare part quality is an issue.
Fantastic to see ! Your persistence is an inspiration and great help . Thank you !!
Thanks, Steven. And welcome!
Back to the wall kind of project with a “I want my car back” shout on the lips.
Great video, UA-cam suggested… I’ve subscribed.👍🏻😎
Welcome! 😊
And I'll say again, this is why these cars are adored by engineers. Nice sleuthery.
Thanks, mate.
Love the wording.
I celebrate your triumph and admire your persistence!
Thanks, Alastair.
It was a very annoying experience to see that all the other cars in the workshop drove so much better with brakes allegedly so much worse.
I love your tenacity! This is my favorite channel 👍
Thanks, Brook. ☺️
Congrats on your success Johannes! Many years ago, turning new rotors on a brake lathe was common procedure before everyone started just installing them. It wasn't uncommon to find that even new rotors needed to be resurfaced.
Thanks, Brad. Yes, and today it’s hard to find a workshop that even owns a lathe.
@@GreasyFingers I may be wrong but i was told that today's rotors are sold at minimum thickness whereas when i was in the industry 40 years ago, rotors could be turned 2 or 3 times before they got to minimum thickness.
I worked at Porsche cars Australia as an apprentice mechanic when your carrera was a near new car. I can tell you that the first operation we would have done in that situation was on-car disc machining. had you done this , problem would have been solved in one day , and at a fraction of what you spent. Im sorry for the loss of time and money you went through.. did you ever consider this or is it not a common operation where you are?
Thanks for commenting, Ben.
I probably didn’t explain the crucial point properly: my problem was that a bent wheel carrier continued to distort the disk. I had changed/repaired the disks a couple of times, but the problem kept returning.
I’m aware about on-car disk machining, actually the market-leading company Hunger is located around the corner from where my workshop is.
I see now, I forgot about that aspect, while the on car machining centres the machining around the theoretical centre, The continued bending from the hub will always be an issue. glad you found it!@@GreasyFingers
Nice to watch whilst having a cup of tea and eating a donut ( music a touch too loud)
Glad to see you happy.
Um diese Dickenabweichung herzustellen muß man sich richtig Mühe geben. Hersteller schämt euch.
Hallo Gerhard.
Ja, aber ich denke, dass der verzogene Radträger diese Dickenabweichung in die Scheibe rein gehauen hat. Original war sie schon okay.
another great post from @GreasyFingers... #Legend
I’m certainly not a legend, but I love the film „I am Legend“.
Kept me from sleeping for about two years.
Some serious attention to detail and diagnosis. Congrats on another great video!
Thanks, mate!
As an one in Engineering specifically in measuring brake rotors I was going to say thickness variation is a HUGE part in pedal vibration. All manufactures demand less than .01mm. Jeep in the early 2000's had to change caliper manufactures because the rubber seals in the pistons didn't pull the pad back off the rotors far enough when releasing the brakes. The pad then wore the "high" side of the rotor and the thickness variation caused pedal vibration...
Thanks for commenting!
My point was: a thickness variation can sure be caused by other components having a failure like callipers, wheel carrier etc. But given the process of manufacturing it’s hard to imagine that you get a new disk with a thickness variation. Or am I mistaken?
@@GreasyFingers All manufactures now machine both sides of the rotor in a single setup. Therefore there sould be almost zero thickness variation. As well the tolerance limit is 10 microns (.01mm). Bad heat treatment(cooling from casting process) CAN leave hard spots that will do it and cheap aftermarket may not do both side in the same machining, but from factory (all, including north amercan manufactures) measure 100% of the rotor including runout and thickness variation.
@@rodkubis384 That’s extremely valuable information. It confirms my suspicion that sloppy transport has caused the problem of my front disks.
I didn't get it how this happened? New discs were like this or they became like this when you put them in the car? And this means that the front of the disc was true but the rear was crooked (thickness)?
Neither do I, but I guess the front disks were corrupted from the start, bad production batch at the manufacturer, I guess.
The rear disks were okay, but the left one got beaten up by the bended wheel carrier.
@@GreasyFingers thanks for replying!
Relentless
You are Johaness , I would like to get a guy like you close to my home to look at my 911’s. . Steph . Could you unveil a bit of your new 911 vintage 70’s ? 😊
Relentless and without mercy.😄
I’m counting the minutes till all customer projects have been processed to finally work on my own cars.
@@GreasyFingers finally , the solution was to replace rear break discs to avoid vibrations th equate gave the measurement on only one face not the red face ? thanks
Sort of. Bent wheel carrier, destroyed disc, but destruction was not evident by run out, but thickness fault.
EPIC!!! friend had similar issue.
It’s very common, as I learned during this project.
Love the smile when you rotate the zimmerman!!
Happy moment! ☺️
Guessing before watching, not OEM hubs and bearings.
Guessed right, Robert.
The price tags are enormous.
@@GreasyFingers Got it, I just had similar problem with Audi S4 B8, went through Zimmermann drilled rotors with Yellowstuff pads, then EBC USR + Red stuff pads, then again EBC USR with Yellow stuff and new replacement hubs, they got bent right away, then with Brembo Xtra discs and pads all over and OEM hubs and bearings :D. It took 3 years to get to the bottom of the issue.
Great episode it help me a lot with my Porsches
Glad it helps, mate!