1969 Chevy Corvette Brakes

1969 CHEVROLET CORVETTE
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CCCBEACH
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1969 Chevy Corvette V8 Two Wheel Drive Automatic
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My 69 Vette has a new/not rebuilt master brake cylinder, bench bled. Problem: With the engine off the brake peddle is decent. Once I start the engine, the power
brakes go to the floor. This is the second master cylinder I've tried, same results. Could the power booster be a problem??

Thank you...........bj
Jul 4, 2008 at 5:03 PM
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MERLIN2021
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Bench bleed the master by getting brass plugs and screw them into the two ports, then pump the master until you cant move the piston any more. Attach the lines, Have an aide press and hold the pedal crack the lines and retighten, repeat this till all air is removed at the lines, Don't let the master run dry, bleed rear cylinders by opening the bleeders and wait until the fluid dripps out. Close bleeders. I think you have air in the system still be it the master, or a caliper, the older calipers can be tough to bleed, sometimes you need to tap on then while bleeding to get the air out. Is the parking brake built into the rear calipers?
Jul 4, 2008 at 6:15 PM