Hi,
I just installed my new rearset and need to know how to rebuild pressure in my rear brake system?
I can't seem to do it right. Please point me to the right read.
Thanks.
Bike is m750
There is no "built-up" pressure in your brake system. Simple single-use hydraulic pressure applied by pressing down on the pedal. The pedal moves a cyliner which creates pressure in the system.
Sounds like you don't have the linkage assembled correctly - OR - if you disconnected the master cylinder supply line or loosened the banjo bolt (brake line) you need to do a bleed job to purge air from the line.
If you need to bleed the brake lines do a search in tutorials.
Quote from: Carbon 14 on March 10, 2012, 08:05:51 PMyou disconnected the master cylinder supply line or loosened the banjo bolt (brake line) you need to do a bleed job to purge air from the line.
If you need to bleed the brake lines do a search in tutorials.
Thats what I did...
Trying to do a bleed job but can't seem to get it right.
1. Open the bleeder
2. Pump the rear brake many time.
3. Close and repeat.
Or should I do a reverse bleed with a syringe?
thats not how you do it
think about it this way, if you open it, air can come in, everytime you pump it, air comes out then you let go, and you make a vacuum, so you just suck air back in.
try holding the pedal, opening the valve to let the built air out and then close it, then pump it again, and repeat.
youtube.com
Also, if the caliper is mounted below the swing arm you will need to remove the caliper, turn it right side up, find a piece metal or other hard material about the thickness of the brake disk and place it between the pads. Hold the caliper so the bleed screw is on top. Now bleed.
i have tried
1. pump the peg many times
2. open the bleeder to let fluid and air come out
3. close the bleeder and release the peg
but the fluid only run out to a certain extend and stop running. I check my res and always keep it higher than Min level. I do see the fluid in the res getting lower though.
see howies comment above. air is trapped via gravity
1. pump and HOLD
2. open valve screw BRIEFLY, then tighten.
3. Release pump
4. Go to 1
You'll do yourself a favor to remove the rear caliper as howie said. suspend it so it is in the air overnight and while you do the bleed. the air bubbles always float to the highest point. with the caliper (and bleed screw) in the air, you are helping it work.
Quote from: seanster on March 11, 2012, 10:06:31 AM
i have tried
1. pump the peg many times
2. open the bleeder to let fluid and air come out
3. close the bleeder and release the peg
but the fluid only run out to a certain extend and stop running. I check my res and always keep it higher than Min level. I do see the fluid in the res getting lower though.
That's exactly how it's supposed to happen.
Quote from: Dan on March 11, 2012, 11:45:42 AM
That's exactly how it's supposed to happen.
yes, but he's probably got air trapped since it's the rear caliper.
i've NEVER been able to bleed a rear without removing it.
Quote from: ducatiz on March 11, 2012, 12:43:22 PM
yes, but he's probably got air trapped since it's the rear caliper.
i've NEVER been able to bleed a rear without removing it.
Right. I was just commenting that how he described the fluid flow was how it's supposed to be.
I never get anywhere with bleeding the bloody thing without bleeding from tne master cylinder banjo bolt. I have also removed the caliper in frustration and shoved some steel between the pads.
A little air in the rear=abs [laugh].
1. Had to disconnect the Res from the master cylinder
2. Unscrew the bleeder valve
3. Pump the fluid from the master cylinder using a syringe to get enough through the system.
4. Quickly connect the Res with full fluid back to the master cylinder.
5. Then do the normal bleeding process...with the caliper up high.
Still have air in the system though, now I'm letting it sit overnight and will bleed more.
Thanks for sharing your knowledge.
Sean