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C3 BRAKE PROBLEM

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  • Jim Markevitch
    #1

    C3 BRAKE PROBLEM

    My 72 coupe has new rotors & pads. All lines were bled from the right rear in order to the left front. I only drive the car on weekends. When first starting the the car I have little or NO BREAKS! Once the car is warmed-up and I have pumped the breaks for 30 to 40 pumps I can now stop the car. I have bled the breaks several times, fluid level is correct whith no leaks found. Once the care is driven for several miles all seems to be OK except the pedal does to be close to the floor when breaking.

    Is the problem in my master cylinder or the system vaccum assist? I'm lost! Any help would be appreciated.
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43202
      #2
      Re: C3 BRAKE PROBLEM

      Jim-----

      65-82 Corvette brake systems can be VERY FRUSTRATING to blled completely of air. I'd say that yours still has some air in the system.
      In Appreciation of John Hinckley
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        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43202
          #3
          Addendum

          Two other things that I should have mentioned: make sure that you are bleeding BOTH bleeder valves on EACH rear caliper. The rear caliper has 2 valves, one on each side of the caliper. The fronts only have one per caliper. Also, make sure that the calipers are installed properly with the bleeder valves at the TOP. The rears can be reversed, side-to-side, resulting in improper positioning of the bleeder valves.
          In Appreciation of John Hinckley
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            • Mike McKown
              #4
              Re: C3 BRAKE PROBLEM

              Jim:

              If you have a spongy pedal, you still have air in the lines. If you have a hard, low pedal, I'd look at the master cylinder. It could by-pass internally. You wouldn't see a leak.
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                • Andrew Meikle
                  #5
                  Check the pads

                  Another thing to check is that the pads are not bowed, I put new pads on my car, and the brake pedal went close to the floor. I bled the brakes several times, then I checked the new pads. I had a friend press the brake pedal, whilst I watched the pads, and I saw oneof them flexing. The two pistons were flattening the bow in the pad. When you took your foot off the brake pedal the pad would spring back to the bowed position. I changed pads and fixed the problem.

                  Andrew
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                    • Jim Markevitch
                      #6
                      Re: C3 BRAKE PROBLEM

                      Thanks All for the input!
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