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Okay guys, I am soliciting your experience and troubleshooting abilities, I am seriously stumped on the brakes on my car (and so is Mike, 1970FastCat who has the same issue). The symptoms are:
- half a pedal that feels as if you go through a mushy first circuit and then the pedal is solid
- no discernable wear-in on front rotors after nearly 50 miles
- rear brakes can be made to lock up on wet pavement but only by standing on the pedal, fronts nothing
What I have done:
- replaced one new master cylinder with another brand new master cylinder and bench bled both to death each time I tried to use them
- vacuum bled, regular (pump, hold, bleed) bled over and over with same results, half a pedal and car is stopping on rear brakes only (which obviously feels like not much brakes)
- checked rear brake shoes for tightness, I hear them drag slightly as they should when I turn the rear wheels
- removed and disassembled previously rebuilt proportioning valve, was put together correctly and found nothing wrong
- checked booster pushrod length against master piston hole depth, pushrod is right length, not too short, not too long
What the brake system consists of:
- all new stainless lines front to back
- all new brake hoses
- rebuilt calipers
- new wheel cylinders
- new pads and new shoes
- cleaned up booster that was working in my first Cougar when taken out of service
WTF is going on, I wish I knew. I am down to the idea of plugging the rear brake port on the master with a fine thread botl and teflon tape and seeing if the fronts will work that way. I don't know what else to do.
Any ideas?
Questions about what I have or the condition or this or that? Ask away.
Thanks,
Bob
- half a pedal that feels as if you go through a mushy first circuit and then the pedal is solid
- no discernable wear-in on front rotors after nearly 50 miles
- rear brakes can be made to lock up on wet pavement but only by standing on the pedal, fronts nothing
What I have done:
- replaced one new master cylinder with another brand new master cylinder and bench bled both to death each time I tried to use them
- vacuum bled, regular (pump, hold, bleed) bled over and over with same results, half a pedal and car is stopping on rear brakes only (which obviously feels like not much brakes)
- checked rear brake shoes for tightness, I hear them drag slightly as they should when I turn the rear wheels
- removed and disassembled previously rebuilt proportioning valve, was put together correctly and found nothing wrong
- checked booster pushrod length against master piston hole depth, pushrod is right length, not too short, not too long
What the brake system consists of:
- all new stainless lines front to back
- all new brake hoses
- rebuilt calipers
- new wheel cylinders
- new pads and new shoes
- cleaned up booster that was working in my first Cougar when taken out of service
WTF is going on, I wish I knew. I am down to the idea of plugging the rear brake port on the master with a fine thread botl and teflon tape and seeing if the fronts will work that way. I don't know what else to do.
Any ideas?
Questions about what I have or the condition or this or that? Ask away.
Thanks,
Bob