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Apr 12, 2024, 1:12 PM

Post #1 of 2 (8303 views)
HELP Sign In

I have a 1956 1/2 ton panel truck, 69 351w, mustang ll fron clip withba 78 mercury AOD I'm working on. I have installed a new disc brakes all around. The rear disc brakes are from a 78 Cadillac and the front disc brakes are from a 78 Malibu. I installed a new booster, adjustable proportioning valve, and a new master cylinder that are from a 87 mustang. I cannot get the pedal to build pressure. The brake works but they only catch at the bottom of the pedal which is not safe. Yesterday I adjusted the push rod that comes from the booster and it made no difference. There are no leaks because I'm not losing fluid when I pump it several times on different days and occasions. I have done a complete 110% visual inspection with no results. Any ideas

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 14, 2024, 11:56 AM

Post #2 of 2 (8104 views)
Re: HELP Sign In

As a rule we don't get involved in Frankenstein projects but your problem sounds like the master cylinder is too small and doesn't have the volume capacity to operate the larger calipers.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


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