Old School Motorcycle Brake Bleeding Technique [Quick & Easy Bleed Brakes] Honda CB750 Project | 31
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- Опубліковано 25 лют 2024
- Old School Motorcycle Brake Bleeding Technique [Quick & Easy Bleed Brakes] Honda CB750 Project | 31
Here's what I used in this video:
DOT 4 Brake Fluid: ebay.us/3c8rNj
Brake Line Spanners: ebay.us/f14fAo
Motorcycle Brake Fluid Reservoir: ebay.us/3gbR0E
in this video I bleed the brakes of my project Honda CB750 café racer. The brakes on this build do seem to be in good condition, I doubt they have been used since they were rebuilt by the previous owner. But that was 7 years ago. Brake fluid is hygroscopic which means it absorbs water, so I suspect in that time it may have absorbed some. Also the back brake has been apart at some time, so does seem to have some air in it. So it is a great idea to bleed both of them
I would use a vacuum bleeder if I was doing this on a car, Mainly because your arms aren’t long enough to reach the pedal and the bleed nipples at the same time. This isn’t as big a problem on a bike, unless you have twin disks at the front, or a complicated ABS system with multiple bleed nipples. On the CB750 with single disks at the front and back it really isn’t a big problem.
There seems to be two schools of thought with manually bleeding brakes. I used to use a method that basically used only one pump on the pedal/lever for each time the bleed nipple is opened. This was, open the nipple, press the lever, close the nipple, release the lever, and then repeat. Now I use the method that I have seen a lot of others use. It is very similar to the other method, but instead of one pump after opening the bleed nipple, you build up pressure in the system with multiple quick pumps first before opening the bleed nipple, then as soon as the lever has completed its travel and pushed the fluid through, you close the nipple and pump again.
However recently I have noticed that a couple of other UA-camrs that I watch and respect, use the single pump method. Which has lead to me wondering if I am using the best method, but both work. I vaguely remember some mammoth bleeding sessions with the single pump method where the air took a long time to come out of the system, which doesn’t seem to happen with the multiple pump method.
It only took a couple of minutes to bleed the brakes on this motorcycle, Single caliper at each end, with easy to access levers. I am thinking about putting an extra disk on the front to give it better braking. Although the Honda CB750 was ground breaking in the '70s having a disk front brake, it wasn't really very powerful, and a well set up twin leading shoe drum brake was just as good, maybe even better, so an extra disk on the front would give it a bit of extra stopping power.
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Interesting video. I've bled brakes both ways, and I prefer to pump the brake a few times before opening the bleeder. Here is why. By adding pressure by pumping the brake a few times, when the bleeder is opened up, the fluid is instantly pushed out. Your hand would still be holding the wrench, allowing you to quickly close the valve before any bubbles can go back into the caliper. When the bleeder is opened before the brake is applied, bubbles can be drawn back inside. I've done it successfully both ways, but I find the second method faster. I suppose it is all about personal preference. Good luck on your shakedown ride and keep the great videos coming.
Thanks. I follow your reasoning, and it does make sense. I cant wait for the shakedown, the Winter has really delayed me, but the sun keeps making a show at the moment.
Very well presented as usual. I'm looking forward to hearing the CB on a driveby video - you can't beat the sound of a classic CB whizzing by 👍😊👍 Whish I still had my blue CB550f2!
Thanks, for your kind words. I am really looking forward to my first ride. I expect it will be very soon. :)
I think the best way is buy some Goodridge speed bleeders. Just open quarter of a turn and pump. And when it's tightened it's as safe as the std ones.
No leaks around the threads and messing around 👍
Thanks for that, I have not seen these before. My first thought was that they wouldn't come in the correct thread for the CB calipers, but they do seem to cover virtually every thread size.
@@SPANNERRASH go for it! You are the master 👍😁
Wandering around the nec bike show all the new bikes seem to have a different style/colour of brake fluid and reservoirs, it does look alot nicer than the older type as in your video,.
I have been thinking about getting a different reservoir, but the cosmetics are on the back burner at the moment.
I intentionally try to use different coloured fluids/oils so that the source of a leak on the floor underneath the motorcycle can be easily traced to the source.
My method is to quarter fill a milk bottle with brake fluid and then make sure the pipe coming from the bleed nipple of your caliper is fully submerged in the brake fluid. You can now open the nipple and pump without the need to keep tightening the nipple back up as no air will re-enter the system. Brakes will be bled in no time at all. That is how I did my CX500C brakes after I had the calipers powder coated and then rebuilt with new pistons and seals.
That way works great, as long as your bleed nipples are a good fit in the caliper, if not then air can be drawn back into the caliper via the threads. Ask me how I know! :)
Thx for the video im old school so the first method of bleeding is my choice always served me well the bikes not far off now so a well earned ride out will be well deserved 👍
Thanks. I can't really remember when I changed from single pump to multi. But it was only recently I spotted somebody I really respected using the single pump method which got me thinking about it. I suspect that as long as you have fluid moving through the hoses it doesn't really matter.
Will try it this season
Cheers.
I am old. This is how you do it. Unless you have a modern bike with ABS that requires a computer to open the servos. Better yet, don't buy bikes that require computers. Buy bikes like this. Yes, Im old 🤓
I guess you are old then? I must admit, I am with you I really don't think I want a computer getting in the middle of my instructions to a machine!