Quote:
Originally Posted by 66sprint
Did you replace the 3 brake hoses?
I had a similar issue on an older car and found one of the front hoses had spilt the inner liner allowing fluid to pass into the outer part of the hose.
It never leaked but you had to push a bit on the pedal before it built up enough pressure to activate the cylinders making them suddenly grab.
If you haven’t put on new hoses, try feeling the old hoses for soft spots.
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I had a customers ford bronco that had very erratic braking, I also tried adjustments etc. I was talking to the local ford dealerships parts manager about it, when he suggested replacing the flex hoses. Seems ford had a bunch of problems with the inner brake hose delaminating and making a block off valve internally in the failed section of the hose, causing very erratic barking. New hoses got rid of the problem. The car was only a few years old at the time, so brake hoses weren't suspect due to age, but they were manufacturer defective.
I have also seen the metal swagged fittings rust internally and the swelling from the rust pinches the rubber hose causing a one way valve, where the brake spring pressure doesn't have enough force to return the fluid to the master cylinder, keeping the brakes applied partially. It causes premature wear of the brake linings, as well as excessive heat to be generated, similar to driving with your foot resting on the brake pedal while driving.
Neither scenario shows anything abnormal from looking at the brake hose externally.
Two instances I had forgotten about until I read the above post.