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Old 07-18-2020, 02:02 PM   #1
Drives: 1987 Camaro
Join Date: Apr 2019
Location: Minnesota
Posts: 3
Soft brakes almost to the floor on my 87 Camaro.

The system has been bled twice, Rear drum brakes have been adjusted(front has Disk brakes) Boost has been checked (holds pressure), check valve Ok. Push rod adjusted. New master cylinder. Bench bled the master cylinder checked out the proportioning valve(combination) , No leaks, Clear fluid. I put on the brakes to stop and the peddle goes down slowly to almost totally to the floor. I'm going to double check the new master cylinder tomorrow . Any thoughts on this any suggestions. Thanks everyone.
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Old 07-18-2020, 02:22 PM   #2
waiting at the tree
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Drives: SIM 2010 2SS/RS A6
Join Date: Apr 2013
Location: Niagara Falls
Posts: 1,969
How is your manifold vacuum?

Is the vac hose from the booster to the manifold cracked?
2010 2SS/RS A6 CAI
Silver ZL1 Rims
60ft 2.03 13.08 at 107.82 (4/28)
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Old 07-18-2020, 03:14 PM   #3
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Drives: 2010 2SS LS3 and 1978 STROKER 383
Join Date: Feb 2018
Location: Czech Republic
Posts: 565
The problem will be inside the brake cylinder.
I'd bet on a damaged rubber band.

I would take out the brake cylinder, disassemble it and reseal it.
...with the help of new rubber bands, of course.
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Old 07-18-2020, 09:31 PM   #4
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Drives: 2010 Black 2SS/RS
Join Date: Nov 2014
Location: FL
Posts: 1,711
master cylinder is leaking internally.
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Old 07-18-2020, 10:10 PM   #5
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Drives: 2010 Camaro 2SS
Join Date: May 2019
Location: Rochester, NY
Posts: 76
I've bought "new" master cylinders for older vehicles before that were defective. Idk if they dry rot on the shelf or of it was sold as new but was a crapily rebuilt one. That would be where I start since it does seem like a leak-by.
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2018 Charger GT+
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