My girlfriend bought a 1951 chevy p/u with a 350 v8 that has been customized. It has a 90-96 ford f150 power brake booster and master cyl. And 76-81 chevy camero frt. Disc and rear drum. Checked all four wheels for leaks found several of the line fittings were not tight and Teflon tape on bleeder screws. Tightened all fittings and cleaned bleeder screws and bled system. That made no difference. One pump the brakes grab and hold the next pump they may or may not hold. Checked for fluid between booster and master cyl. Found none. The booster did not have a check valve so I installed one. Still same problem. I did notice what appears to be grease coming from inside the booster on the piston rod. I am thinking that the master cyl. Is bypassing internally. How can I be sure the booster is working properly?
Thursday, January 5th, 2012 AT 4:43 PM