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Old 08-14-2006, 05:47 AM
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No brakes on my 55 chevy

I'm still having a problem with the brakes on my 55 Chevy, as I mentioned in an earlier post, the car has 4 wheel disc brakes. I replaced the rear brakes with new rotors, calipers and pads. The brakes were bled, but I could not get a pedal. I had a friend come over and we bled the brakes again, running almost a quart of fluid Thur the system. He seemed to think the master cylinder was bad, so I replaced that but still could not get a pedal. What does the proportions valve do?? I'm really confused, it's like pressure is not building up on the rear brakes. Rear end is out of a mid 80's Trans Am.



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Old 08-14-2006, 10:28 AM
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Here are a few questions, what type of master cylinder dual or single? You need a dual. Something else to be aware of is master cylinders as you know are power and manual and use different length actuator rods. The proportional valve allows the braking system to regulate the system balance, making that balance 60 % front and 40% rear braking. The %?s are not exact but indicate the operation of the valve.
Did you do a bench bleed of the master cylinder?
If so here is the next step, that 55 is a good car for a gravity brake bleed. Just go to the pass side of the car front or rear, open the bleeder and just watch until you see brake fluid with no air and close the bleeder, using the clear tube and bottle catch method. Then go to the driver side (short run from the master cylinder) and do the same. Work on one set of brakes at a time, front set or rear set. If you think about you will see that the car has two separate brake systems front and rear and are totally isolated from the other. Just make sure the master cylinder does not run out of fluid or you will introduce more air into the system.
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Old 08-14-2006, 10:38 AM
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If these calipers are anything like the Seville calipers--
You need to adjust the parking brake FIRST

Also on my 59--I had to remove the calipers to point the bleeders to the
high side--when mounted the bleeders are not at the top of the piston bore. has a better description on how to do this in their intruction area of their web site

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