Lou
Member
I determined that I'd pressure bleed my brakes before going to the fall rally as it had been several years. With the pressure bleeder up to 10 psi I found that the master cylinder began leaking out the back and down the booster. I bought a new master and before installing it I pulled the booster, wire brushed it and painted both master and booster. I bench bled the master, installed it and pressure bled the system. Then the fun began.
The brakes were very sensitive to pedal pressure and would try to lock up with to much pedal effort. I put the old master back on and had the same problem. After some discussion with others I installed a new combination valve. Same problem. A brake shop took a look at it and said it was the master but that to make sure it system was "done right" the right caliper should be replaced and the rotor turned, for $800.00! That ended that conversation. Having now driven it around for a day or two I trusted the brakes enough to drive up to lake francis for the ihonlynorth fall rally. While no one was sure the best bet was the booster though no one could explain how a bad booster would create a hyper-sensitive brake pedal. On the way home today Jeff Ismail was good enough to open his shop on a Sunday and sell me a booster. He even offered his shop floor for me to do the replacement. I elected on getting it home in case it wasn't the booster and I needed to be close to my beer supply. After a quick swap a test drive proved that the problem was fixed, the brakes work great. Thank you Jeff.
My only question: how in the world does a booster create a hyper-sensitive pedal?? Any bad booster I've ever had created a very hard pedal.
The brakes were very sensitive to pedal pressure and would try to lock up with to much pedal effort. I put the old master back on and had the same problem. After some discussion with others I installed a new combination valve. Same problem. A brake shop took a look at it and said it was the master but that to make sure it system was "done right" the right caliper should be replaced and the rotor turned, for $800.00! That ended that conversation. Having now driven it around for a day or two I trusted the brakes enough to drive up to lake francis for the ihonlynorth fall rally. While no one was sure the best bet was the booster though no one could explain how a bad booster would create a hyper-sensitive brake pedal. On the way home today Jeff Ismail was good enough to open his shop on a Sunday and sell me a booster. He even offered his shop floor for me to do the replacement. I elected on getting it home in case it wasn't the booster and I needed to be close to my beer supply. After a quick swap a test drive proved that the problem was fixed, the brakes work great. Thank you Jeff.
My only question: how in the world does a booster create a hyper-sensitive pedal?? Any bad booster I've ever had created a very hard pedal.
