Vibration While Braking? (How I diagnose warped rotors)
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- Опубліковано 12 гру 2019
- In my estimation warped up brake rotors are usually the cause of a vibration while braking. It is very common and I deal with it as a technician regularly. In this video I I first explain how I diagnose warped up brake rotors using "guesstamation". Do note that the first method shown does use a little guess work but is usually pretty accurate when it comes to diagnosing a vibration caused by warped rotors. The second method I show is more accurate and is the "text book" way to confirm a warped rotor.
Once it is determined that the vehicle has a vibration while braking it will then be necessary to figure out weather the vibration is caused by warped front rotors or warped rear rotors. I do this by paying attention to the steering wheel while braking. Usually when the front rotors are warped up it will cause a wobble in the steering wheel while the brakes are applied. Usually when the rear rotors are warped up it will caused a vibration in the seat while the brakes are applied. Once I determine weather the front or the rear rotors are suspect I will then measure the thickness of the rotors to determine if they are able to be turned or not. Once they are measured and it is determined that they are thick enough I will then turn the rotors. Typically it will be very noticeable that a rotor is warped when they are being turned as you can see the wobble of the rotor against the bit of the brake lathe. Once the rotors have been turned I will then measure them again to be sure they are still within specifications. This is my way of addressing warped rotors.
A more accurate way to diagnose warped brake rotors would be to used a dial indicator. Of coarse you will still want to get an idea of which end of the vehicle the vibration is coming from by paying attention to where you feel the vibration as explained before. Once you determine which end of the vehicle the vibration is coming from you would then want to measure the warpage of the rotors that you suspect are warped. If you find the rotors are warped it would then be advised to turn them. (Always measure the thickness of the rotors before and after refinishing them to confirm that they are within specifications.) Note: you can find a specification for warpage or run out in a repair manual. )
As mentioned in the video, a faulty component other than the rotor can cause a false reading when measuring warpage. If you are suspicious that the warpage reading is caused by another component then it would be advised to measure rotor warpage while the rotor is mounted to a brake lathe. This will give you a true warpage measurement of the rotors in suspect.
Note: It is my recommendation that when turning rotors they should always be turned in pairs. i.e. front right and front left or rear right and rear left. It is also my recommendation that the pads be replaced on whichever rotors are turned. This in my opinion reduces the risk of brake squeak and helps the vehicle to have equal and even braking force.
Note: Do not turn rotors passed the specification for thickness outlined in you repair manual.
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Hi, I have a 2017 dodge grand caravan. I have had my front rotors turned and replaced several times. The owner of the shop said the front rotors are notorious for warping. The rotors ate less than a year old and I just had them turned last week before going on a trip. I drove 800 miles and the vehicle started shaking while going down steep hills. I was actually very careful this trip and didn't ride the breaker at all. During the last repair the mechanic stated that the only way to permanently fix this problemb is to buy cold forged rotors and that they are super expensive. Does this sound right? Thanks for your help.
awesome vid! thx!!!
No problem!
For some reason alot of utube videos don't call it warped rotors. They call it runout. I prefer the term warped rotors. Just rebuild front right caliper due to frozen piston. Ruined rotor causing warpage. I replaced the rotors. But bought adial indicater w/magnetic base to double check the hub
I also prefer the term warped rotors. Hope you talk goes well. Thanks for commenting.
You seems to have a very enriched knowledge about brakes and cars in general. It is very rare to find an honest mechanic these days..everyone is after the $$$ and sell crap.Where are you located in the US?
does warped rear rotor likely to cause the steering wheel vibration? I have just replaced front rotor 1 month ago
I wonder if its ever been a bad hub or even lug nuts not tighten to spec??
so, what is the tolerance when using a dial indicator?
Thanks for the video. I have changed my front rotors and pads because it was diagnosed with - Offside Front Service brake fluctuating. After the rotors and pads were changed only in the front, I still had a similar fluctuating issue. The steering is not vibrating, it feels like something is stuck on the rotors and has this intermittent braking feeling. I have changed the front rotors and pads again recently and I still have to drive the car to see if the symptoms persist. I intend to change the rear rotors and pads asap. If the symptom will persists even after changing the rear rotors and pads, what would you suspect? My car is a Mazda 3, petrol, from 2016. Thank you.
Id suggests having a tech look at it. Find out exactly what is causing the problem. Go from there.
@@BarboursAutoHelp Hi. Problem solved by changing the rear discs and pads. All the symptoms are gone now. Your method of diagnosing warped rotors is efficient, at least it worked in my case.
Both rear rotors (discs) look bad on the inside and also on both sides the inside pads were stuck - not sure if this contributed to the symptoms. I have cleaned the calipers, sliding pins and replaced both rotors and pads - no more vibrations. Thanks mate!
Thanks for the update. Good luck to you.
Great information....
Thanks
Hey there, I changed my brake pads recently after running the old ones with the wear indicator squealing (my bad) for like 200 miles. After changing the new brake pads, I feel a little shake in steering wheel when I apply brake above 120kmph. It feels like I have slightly damaged one or more rotors with the old brake pads. But what I don't understand is how come I didn't feel the vibration with the worn-out brake pads, but only with the new brake pads? Another thing is, the pads on my front and rear left worn out more than the ones on the right. What could be the reason? Thank you so much!
Check your sway bar links
I installed brand new rotors and brake pads. Rear and front. Idint have a vibration before with the old ones. Since I got the new ones my whole car shakes except for the steering wheel.
Dawg! That stinks! Sounds like maybe bad parts? Not sure, friend.
Maybe the wheels weren't tighten correctly or you need an alignment
@@BarboursAutoHelp replace rear rotors and pads. Problem solved
@@danielguzman8346 where the new ones bad ? You replaced them the 2nd time and it fixed the issue?
@@SavvyCris eventhough everything was brand new. I had to replaced the rear rotors and pads . vibration gone.
Would shaking from left front end be a dead give away of new rotors
Not necessarily
the rotor has to be g;owing hot before it can warp, the very common cause is your gliding pin,they cant move freely anymore, because it has rusted already and makes the pads engage to the rotors that causes pulsation or steering vibrate, have the problem on my 2003 camry , cleaned the gliding [pins sanded the bore of the pins put some lube ,,,,, my smiles are to my ears,,,, the problem is gone
wdym by gliding pin? caliper pin?