1MYTGTX
Well-Known Member
A little backstory to my new problem on my new to me ‘67 GTX.
The car was upgraded to pin type front discs from a ‘72 B body. It had a drum brake power booster on it along with a “universal” disc brake master (one with provisions for ports on either side…. Hated the way it looked) It also retained the original drum brake distribution block (no prop valve)
The brakes worked fine. Good pedal feel but required extra pedal effort due to the drum brake booster (which also worked). Pretty much should have left it alone!!!!!!
Fast forward to my brilliant idea to put in a repro Bendix booster (from Cass @ Dr Diff) and swap out the master for a NAPA reman I had in stock from my old Charger ( lines exiting on manifold side) and new lines to when my troubles starts
After bench bleeding the master, gravity and old school “pump & hood the pedal down” bleeding, adjusting the booster push rod correctly with the pin tool I am experiencing the front brakes excessively grabbing at the bottom 2” of brake travel. So hard that it will put you through the windshield. Almost feels like a “2 stage” master.
2 things I can think of is possible air in the system (pedal feels rock solid with no sinking with car off) or could it be possible the distribution block is jammed?
I realize it should have at least the A body disc/drum prop valve that Cass sells but wouldn’t having that prevent the rears from locking up? The problem I am having is just the opposite. The fronts are locking up at certain pedal travel. Super sensitive.
Any ideas?? Sorry this was so long but I wanted to give as much info as possible
The car was upgraded to pin type front discs from a ‘72 B body. It had a drum brake power booster on it along with a “universal” disc brake master (one with provisions for ports on either side…. Hated the way it looked) It also retained the original drum brake distribution block (no prop valve)
The brakes worked fine. Good pedal feel but required extra pedal effort due to the drum brake booster (which also worked). Pretty much should have left it alone!!!!!!
Fast forward to my brilliant idea to put in a repro Bendix booster (from Cass @ Dr Diff) and swap out the master for a NAPA reman I had in stock from my old Charger ( lines exiting on manifold side) and new lines to when my troubles starts
After bench bleeding the master, gravity and old school “pump & hood the pedal down” bleeding, adjusting the booster push rod correctly with the pin tool I am experiencing the front brakes excessively grabbing at the bottom 2” of brake travel. So hard that it will put you through the windshield. Almost feels like a “2 stage” master.
2 things I can think of is possible air in the system (pedal feels rock solid with no sinking with car off) or could it be possible the distribution block is jammed?
I realize it should have at least the A body disc/drum prop valve that Cass sells but wouldn’t having that prevent the rears from locking up? The problem I am having is just the opposite. The fronts are locking up at certain pedal travel. Super sensitive.
Any ideas?? Sorry this was so long but I wanted to give as much info as possible