Can't get the rear brake to bleed?

[forrest411]

I'm trying to bleed the rear brake. I have a tool that forces fluid through the bleeder screw towards the reservoir. I got a lot of air bubbles out at first and then just fluid. Repeated several times, but I still have no pressure at the pedal. I think there must be air trapped between the master cyl and the reservoir.

 

THe person that I got the bike from took everything apart to paint the frame and couldn't get it back together so I have no idea if it worked before or not. But there is no sign of it leaking anywhere.

 

Thanks for your help.

[NYUK]

I'm trying to bleed the rear brake. I have a tool that forces fluid through the bleeder screw towards the reservoir. I got a lot of air bubbles out at first and then just fluid. Repeated several times, but I still have no pressure at the pedal. I think there must be air trapped between the master cyl and the reservoir.

 

THe person that I got the bike from took everything apart to paint the frame and couldn't get it back together so I have no idea if it worked before or not. But there is no sign of it leaking anywhere.

 

Thanks for your help.

forces fluid through the bleeder screw TOWARDS the rezzy? a mighty vac? if u can t get a pedal the m.c. is beat.

[RadarRacing]

It seems to me that banshees are the worst to bleed. Yes you probably have air in the master cyl. I've had to tie a caliper higher than the master cyl and pump the heck out of it to get em to bleed, I've used the vacuup pump that sucks fluid (best way) and I've even seen a bike we sat on the grabbar overnight. The vacuum bleed way seems to be 100% the way to go.

[forrest411]

It seems to me that banshees are the worst to bleed. Yes you probably have air in the master cyl. I've had to tie a caliper higher than the master cyl and pump the heck out of it to get em to bleed, I've used the vacuup pump that sucks fluid (best way) and I've even seen a bike we sat on the grabbar overnight. The vacuum bleed way seems to be 100% the way to go.

Thanks for the idea. I have a syringe with a rubber hose on it that I use to fill the brakes from the bleeder screw. Usally that removes all the air. But not this time! I used the syringe to vac out the air from the bleeder. Now the pedal is a firm as ever.

 

Thanks for the idea!

[WINDYCITYJOHN400]

double check that you have the copper washers in place on both sides of the brake line fitting at both the master and the caliper. (there are 2 at each end sandwiching the fitting) if one is missing you can get fluid moving, but not get pressure. May not be it....but it happend to me once. I didn't leak either...just wouldn't make pressure.

Good Luck.

[midlifecrisis]

It seems to me that banshees are the worst to bleed. Yes you probably have air in the master cyl. I've had to tie a caliper higher than the master cyl and pump the heck out of it to get em to bleed, I've used the vacuup pump that sucks fluid (best way) and I've even seen a bike we sat on the grabbar overnight. The vacuum bleed way seems to be 100% the way to go.

X2, Im with Radar. I had one hell of a time bleeding the rear and the fronts last weekend, took forever, but it did eventually bleed correctly.

[pabansheematt]

vacuum pump is the way to go. If that dont work you got a problem.

Edited November 7, 2010 by pabansheematt