I have a 69 with power disc/drums About 4 mos. ago I replaced the master cyl. After about 4 wks of driving I lost the pedal figured it was the cheapo rebuilt master. Bought a new napa unit. And after a couple of mos. I lost the pedal again.M/C was bench bled. Rears are working, with not much pedal. I feel it is sucking air some where in front.New items m/c, rf caliper,new hoses,1 new hard line. No kinks,leaks.The only thing I haven't changed is the hold off valve,metering valve. Any ideas? Thanks John

ahh.. you don't need front brakes- all they do is slow you down. if front brakes were necessary, you'd think they'd be on Top fuelers..

You could make up a new line to bypass the hold off valve. It is only needed when driving on ice or slick mud with auto trans and auto choke.
Sounds like it's sucking air somewhere.
David

novaderrick-LOL I always thought a parachute would be cool.
David bypassing the hold off valve will be my the next thing I'll try. Thanks John