Rear brakes, master cylinder and proportioning valve questions!
10-05-2012, 07:14 AM
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Car: 92 Chevy Camaro RS
Engine: 3.1L V6
Rear brakes, master cylinder and proportioning valve questions!
So my brother just recently bought a 91 Camaro and we replaced both axle seals and both wheel cylinders and brake shoes. Now when we try to bleed the brakes we get some fluid the first time then the second very little because of the prop valve. to get it the valve to open you have to put the pedal to the floor and the valve will open again( we know this because the brake light comes on, on the dash) and then you can get more fluid. Is this normal? Also, when pressing the pedal after it is hard, large air bubbles arise from inside the master cylinder. I dont think this is normal.
Last edited by Twessing; 11-12-2012 at 07:36 AM.
10-06-2012, 02:52 PM
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Re: Rear brakes, master cylinder and proportioning valve questions!
Need to bench bled the M/C. It was likely run dry while the wheel cylinders were replaced.
RBob.
RBob.
10-06-2012, 05:43 PM
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Rear brakes, master cylinder and proportioning valve questions!
sounds like u tore the seal on the piston in the master.
always and i mean always put a small block of wood or some object under the brake pedal so u can not push it all the way down when bleeding the brakes .
what happens is after years of use dirt builds up ini the end of the bore in the master since u never push the pedal all the way to the floor so the piston never moves threw the whole bore. this lets dirt and junk build up.
now when u bleed the brakes and push the pedal to the floor the piston in the master passes over the built up dirt and tears the seal
always and i mean always put a small block of wood or some object under the brake pedal so u can not push it all the way down when bleeding the brakes .
what happens is after years of use dirt builds up ini the end of the bore in the master since u never push the pedal all the way to the floor so the piston never moves threw the whole bore. this lets dirt and junk build up.
now when u bleed the brakes and push the pedal to the floor the piston in the master passes over the built up dirt and tears the seal
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