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Old 08-03-2013, 09:29 PM
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65 Impala brake issue

Okay here goes. Any help or guidance would be greatly appreciated.
65 impala ss 283 2 bbl. Bought classicperform std 4 wheel disc brake setup. Originally had drums all the way around.

installed everything no major problems until bleeding. pedal very very soft had to push all of the way down to get any brake. Tried to use a power bleeder from the master and I think I pumped it up too much air/pressure and got fluid coming out from the base (where the master / booster connects)....I Gave up, took it to someone that actually knew what the heck they were doing and had them power bleed it. Now the brakes are very very hard and are acting almost like non power drum brakes but even when I slam them to the floor, it barely stops....Did a check on vaccum and getting 18-22 at idle.

So my question is this...
1) Did I damage the master or the metering valve when I pumped too much pressure into it?
2) Is there just something wrong with the booster or the check valve so that is is not holding vacuum?

One last thing, the guy that bled them said that I might need a proportioning bias but I thought the metering valve has a built in prop valve in it?

What I have not tried is pumping the brakes up and then turning the car on and see if the pedal goes down. I am pretty sure that it does not though. Will check in the morning.

Again, any guidance would be greatly appreciated.

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Old 08-03-2013, 09:57 PM
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Did you change your pedal ratio. Drums use a 6 to 1 ratio. Power discs like 4.5 to 1. You need to drill a hole in the brake pedal arm about 1 1/2 inches lower for the push rod.
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