Help..back brakes no pressure By Random Hero (Read 876 times)

[jhbietz]

I'm assuming that the master cylinder was working fine before. They can be very difficult to lead. I push the pistons all the way in and use a wood wedge to hold them there. Then put Teflon tape on the threads of the bleeder valve and use a vacume leading kit. People have removed earner the master cylinder and lowered it to below the caliper or removed the caliper and raised it above the master and bled them the regular way. Eather way you get the air to go up.

[Alleyoop]

Well that does not seem right that the Pistons are already pushing the pads and hitting the pads. I would try pusing a shime in between the Pads to push the Pistons in and hold them there and then put it up and bleed it.
Alleyoop

[jhbietz]

Yep, sometimes it seams like when the pistons are extended they hold an air bubble that don't want to come out.

[abscooters]

Have bled several different systems and some can be little bastards to get right. ;D

Often times you have to remove the brake line from the caliper and actually hold it in the top opening of reservoir to get it primed before you start bleeding. it is actually easier to remove the caliper & brake line and bleed the whole assembly while it is not attached to the bike. That way you can move pieces around to get air pockets to move towards the bleeding valve.

I just find it easier to get it bled and then go through the hassle of fishing it through the body. Than fight to bleed it in place and end up getting that fluid all over the places where it shouldn't be, and still end up ending up removing it to get it done right.

[looker]

Have you fixed it yet? Hope it's not too late, but this might help.
Use a small length of rubber hose that is a tight fit over the bleed nipple and a long length of clear hose that the rubber hose will also fit over. Open the bleed nipple and suck on the clear hose, if the hose is long enough you won't get a mouthfull of brake fluid, and remember to keep an eye on the reservoir. If it works, you'll see all the air come out with the fluid, which it sounds like you still have some in there.