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Old 03-21-2007, 09:46 PM
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new brake system problem

Hey everyone, need a little brake help. Background info first. The car is a 68 Impala, I have swapped in Corvette front discs, stock rear drums, dual 8" booster, disc/drum MC and prop valve. I've also installed new brake lines. So all the new parts have been installed, and the MC was bench bleed before installation. So I figure my next step is to pressurize the system and start the proper bleeding process at each wheel. But my problem is that I'm getting no pressurization at all. The pedal feels good but it goes to the floor every time and there is no pressure building. Does this mean a bad booster? Is there any special way to deal with a dual booster? I thought I was so close, but now this hurdle Any help is appreciated. Thanks!

Romeo

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Old 03-22-2007, 06:29 AM
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Try gravity bleeding them.
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Old 03-22-2007, 08:23 AM
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Are you sure the M/C volum is big enough for the Corvette calipers?
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Old 03-22-2007, 08:13 PM
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Ok after trying a few things I've found that the booster seems to be functioning right, the MC was bench bled and seems to be in working order. So my next check was the proportioning valve. First I wanted to see if fluid was even making it's way out through the prop valve as the brake pedal was pumped. So I disconnected the two front lines and the single rear brake line that came out from the proportioning valve. Then as my helper slowly pumped the brake pedal, fluid was only coming through the two front lines but not the rear. Is this normal or am I missing something? Is this a bad prop valve? Any help is appreciated. Thanks!

Romeo
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Old 03-23-2007, 12:30 PM
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I was told disc brake and drum brakes are different master cylinders .I would plug the2 holes in master to make sure pedal is hard,like rock hard.I had to use 10lb residual valve on 57chev to get brakes to work properly.Was a fellow this week bought new master and it turned out faulty...
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