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Old 05-07-2003, 06:44 PM
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Post 74 corvette no rear brakes

Again Im hear looking for answers and thanks to all of you who have tried to help so far.

I have 74 vette power brakes. it was basket case and I rebuilt frame up. Every thing for the brakes has been replaced except for a few brass junction blocks. New master cylinder, new proportioning valve, new line steel and all new hoses, new calipers. I know postively for sure there is no air in the system. Used pressure bleeder at 30 psi ran over a gallon of fluid thru the thing. Good flow, etc... No leaks at all and its not sucking air in. Did all 6 bleeders. Left it sit ubder pressure for 24 hours at 40 psi with no leaks anywhere.

I can't get the rear brakes up no matter what I do. Pedal in non existant for the first few inches of travel and then the pedal firms up against the front brakes about 2 inched from the floor. Have also tried 3 master cylinders and 2 proportioning valves to no avail.

The brake booster was also rebuilt and in a box when I bought the project. I'm pretty sure the rod at the master cylinder is adjusted properly is it possnble something could be out of wack on the pedal side of the booster, or could they have done something wrong when they rebuilt th booster???

Any suggestions?

Thanks,
Dave

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Old 05-08-2003, 03:50 PM
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The only thing that comes to mind since you have new brake flex hoses and new calipers is you might have a bad combination valve.
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Old 05-14-2003, 03:49 PM
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i think joe is right. it sounds like a bad combo valve. also check to see if the pistons are even working in the rear calipers. i work for a gm dealer and i have got new calipers out of the box and the pistons would be froze to the cylinders.
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