n3xxus Posted June 2, 2015 Share Posted June 2, 2015 Hello, Been trolling around this site for a couple of years using everyone's suggestions and experiences; however this is my first time posting here. My '99 is having rear brake issues, I would like to troubleshoot further and try to fix it myself before bringing it in to get fixed at the shop. I think I have narrowed it down to brake fluid not being able to return to the MC. Issue: Rear brake is locked up, rear brake pedal cannot be pressed down, to reset and release, I have to bleed the system at the rear caliper, this release the rear brake, I can drive around a bit and then after a while it will lock up even if just using the front brake, (I guess the rear gets engage because its a linked system). Now I'm guessing the return line to the MC has failed or can it be the PCV? I have checked the pads in the rear brake and are wearing down evenly. Any help would be greatly appreciated. Link to comment Share on other sites More sharing options...
Member Contributer KevCarver Posted June 2, 2015 Member Contributer Share Posted June 2, 2015 It could be the 16 year old brake lines. They can deteriorate over time internally and a kind of check valve develops to prevent the return of fluid. Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted June 2, 2015 Member Contributer Share Posted June 2, 2015 Well if the rear lock-up happens with just using the front brake, then I'd say the problem is with the secondary master cylinder (on the left fork leg) not allowing fluid to release back from the calliper. I'd start by removing and giving that a thorough clean. Link to comment Share on other sites More sharing options...
TNRabbit Posted June 2, 2015 Share Posted June 2, 2015 I agree with the above post. There is a small hole in the reservoir it allows fluid back through and my guess is that it's clogged up Link to comment Share on other sites More sharing options...
Member Contributer JeffInFranklinTN Posted June 5, 2015 Member Contributer Share Posted June 5, 2015 Push on that secondary master on the front fork. It will take some force. It won't move much but you should be able to push the plunger in and it should go back to it's "released" position quickly. Also, check the return hole in the rear brake master cylinder. Link to comment Share on other sites More sharing options...
n3xxus Posted August 18, 2015 Author Share Posted August 18, 2015 Well, it looks like the PCV is shot. Going to clean the whole brake system. Thanks for all the info. Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted August 19, 2015 Member Contributer Share Posted August 19, 2015 And WELCOME !!! Link to comment Share on other sites More sharing options...
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