fox_forma Posted October 28, 2006 Report Share Posted October 28, 2006 I have been having troubles with my back brake not fully releasing so i pulled the back brakes off, replaced the seals in the caliper and cleaned everything up real nice. Got back to bleeding the brakes and they worked how they should, the pedal would return fully after let off. I capped off the fluid and the back brake was stiff again and wouldnt fully return once pressed down. I cant for the life of me get this fixed. I have been using a mighty Vac to bleed the system and nothing, it was normal for a good 30sec and then went back to being messed up. If I press down on the pedal it will return a little then I have to pull it up the rest of the way so it wont drag the brakes. Any ideas on this? Nothing is leaking anywhere either. Quote Link to comment Share on other sites More sharing options...
EastCoast Banshee Posted October 28, 2006 Report Share Posted October 28, 2006 Sounds like your master cylinder might have a bad seal. If all else fails pick up a new master cylinder it wont cost much at all on ebay. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 28, 2006 Author Report Share Posted October 28, 2006 I just thought it was odd that it worked for a little then went back to its old habit. I will check that out tomorrow and see whats up. I pretty much overlooked that cause I didnt think it came apart for some reason. :: Quote Link to comment Share on other sites More sharing options...
bansheefreak Posted October 28, 2006 Report Share Posted October 28, 2006 you might check the brake lever too make sure its not bent and hitting something on return... also might need a new spring to help it return.. Quote Link to comment Share on other sites More sharing options...
alisn4x4 Posted October 28, 2006 Report Share Posted October 28, 2006 sounds like what happened to a buddys quad. it was the rear caliper piston sticking. it was due to sand and other crud stuck in the piston area... we seen where it normally returned but it then had a splight bit of residue that hardened and wouldnt let the piston return fully. over time i guess the stuff kicks up in there and with age just decreases the smoothness of it. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 28, 2006 Author Report Share Posted October 28, 2006 I pulled the master off and it looks like the seal that was for the line that runs to the caliper was pretty dirty and a little chewed up. I replaced that, re-bled the brakes and it seemed to work. This was really late last night so I figured I would let it sit over night. Just woke up so bout to go check. Can the whole master cylinder come apart? It looks like it does in the manual but the only thing I could see that came apart was the lino out of it to the rear caliper. How does the rest of it come apart if it does? Quote Link to comment Share on other sites More sharing options...
BANSHEEPRO Posted October 28, 2006 Report Share Posted October 28, 2006 I pulled the master off and it looks like the seal that was for the line that runs to the caliper was pretty dirty and a little chewed up. I replaced that, re-bled the brakes and it seemed to work. This was really late last night so I figured I would let it sit over night. Just woke up so bout to go check. Can the whole master cylinder come apart? It looks like it does in the manual but the only thing I could see that came apart was the lino out of it to the rear caliper. How does the rest of it come apart if it does? CHECK THE POST YOUR PEDAL PIVIOTS ON THEY GET RUSTY AND CORRODED AND SOMETIMES HANG UP ON YOU BUT OTHER THAN THAT CHECK WHAT THE REST OF THE GUYS ON HERE SAID ALLREADY Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 28, 2006 Author Report Share Posted October 28, 2006 it seems to be ok now, I guess it was that seal where the line out goes on the master cylinder. I'm still curious if that whole thing can come apart or not to get to the spring inside and everything. Quote Link to comment Share on other sites More sharing options...
BANSHEEPRO Posted October 29, 2006 Report Share Posted October 29, 2006 it seems to be ok now, I guess it was that seal where the line out goes on the master cylinder. I'm still curious if that whole thing can come apart or not to get to the spring inside and everything. YES IT CAN COME APART Quote Link to comment Share on other sites More sharing options...
535banshee Posted October 30, 2006 Report Share Posted October 30, 2006 pull the rubber boot back and inside there is a small snap ring. remove the snap ring and pull it apart. there is a small u-cup(seal) on the piston. Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 30, 2006 Author Report Share Posted October 30, 2006 pull the rubber boot back and inside there is a small snap ring. remove the snap ring and pull it apart. there is a small u-cup(seal) on the piston. Thanks, I couldnt figure it out so thanks for clearing that up, as of now though the brakes seem to be just fine and havent froze up yet since it has been back together. Quote Link to comment Share on other sites More sharing options...
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