MAD IN NC 21 Report post Posted November 28, 2008 During the rebuild I have replaced the Booster and Master Cylinder. Bench bled the MC and installed, bled the system but here is where the problem lays. It won't hold pressure - I have replaced the back wheel cylinders and no matter how much time I bleed them - they will loose pressure. Even when the pedal is solid - the damn brake light is on... BTW - there are no leaks! Q: Could it be the proportioning valve? Quote Share this post Link to post Share on other sites
opie_803 14 Report post Posted November 30, 2008 you could also check your plunger in your master cylinder. if the o-ring is bad on the rear brake side, it could be allowing the fluid to by-pass it, loosing applied pressure. just a thought. Quote Share this post Link to post Share on other sites
MAD IN NC 21 Report post Posted November 30, 2008 Removed the MC and distribution block/ proportioning valve.... The proportioning valve was still under pressure, the switch contacts bad and after looking at the fitting on the block - I jsut don't trust it! It appears once again somebody was there before me :surrender: Time to call Dennis at discbrakeswap.com ............... Quote Share this post Link to post Share on other sites
69in2006 11 Report post Posted November 30, 2008 Sure sounds like proportioning valve... just my $.02 Quote Share this post Link to post Share on other sites
MAD IN NC 21 Report post Posted November 30, 2008 Yep, I think so but when everything is out I'm double checking everything! Picked up a new block with proportioning valve from Dennis for $69! Beat the heck out of NPD and others by ~$50- $70! Booster makes a noise like you're stepping on a bag pipe - also will change that.... BTW - 69in 2006, how's your's coming along. I have Bill's engine in and running! Sweet! Trying to hit Henri's in town to finish the exhaust before X-mas! Quote Share this post Link to post Share on other sites
69in2006 11 Report post Posted December 2, 2008 Slowly......But gettin' there...Have always heard GREAT things about Bills engines... Henry's does awesome work.... great price too... Quote Share this post Link to post Share on other sites
