Brake issues, aftermarket booster?
#1
Brake issues, aftermarket booster?
When I got my 71 Cutlass Supreme Convertible, the brakes were awful. I replaced the master cylinder, prop valve and booster with a kit I got from Inline Tube and replaced the lines with SS ones from the same place. New calipers, fresh wheel cylinders, etc., etc. The brakes were amazing after all that!
For a while, all was working. Recently, though, I have noticed that I cannot stop the car like I used to be able to. Right now, if I stomp hard on the brakes, the car will eventually come to a stop --- but if I had done that last year, it would have locked all 4 wheels. In a panic stop right now, I'd be in trouble... I get a firm pedal, just not much braking power.
I just yesterday replaced the master cylinder (again) with a new one from Summit, but that behaves exactly the same as the old one. I am considering just replacing the entire booster, m/c and prop valve (again) to get reasonable stopping again. I am thinking it is probably the booster, just because so many threads seem to reference it (here's one). Before I pull the trigger on that, does anyone have any suggestions as to what I should try? Should I replace just the booster? Is there a good brand I should try (want to keep it stock looking)?
Here's what I have tried so far:
For a while, all was working. Recently, though, I have noticed that I cannot stop the car like I used to be able to. Right now, if I stomp hard on the brakes, the car will eventually come to a stop --- but if I had done that last year, it would have locked all 4 wheels. In a panic stop right now, I'd be in trouble... I get a firm pedal, just not much braking power.
I just yesterday replaced the master cylinder (again) with a new one from Summit, but that behaves exactly the same as the old one. I am considering just replacing the entire booster, m/c and prop valve (again) to get reasonable stopping again. I am thinking it is probably the booster, just because so many threads seem to reference it (here's one). Before I pull the trigger on that, does anyone have any suggestions as to what I should try? Should I replace just the booster? Is there a good brand I should try (want to keep it stock looking)?
Here's what I have tried so far:
- Replaced the master cylinder (yesterday).
- Bled and bled and bled the system many, many times. Using a pressure bleeder, using a helper, using a vacuum pump.
- Dug into the drums looking for leakage or problems (nope).
- Pulled apart the calipers looking for anything out of the ordinary. I saw that the shims on both outboard pads have broken and slipped (see below), but I doubt if that is the cause.
Last edited by Mark71; October 20th, 2019 at 02:43 PM.
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