Brake stumper

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  • Randells57
    Registered Member
    • Apr 2018
    • 3

    Brake stumper

    Ok I am Stumped. I have a disc/drum set up. I have been trying to bleed the system, after putting new calibers on the front. When I pump the pedal I have no air. Then hit the brake after bleeding I have no pedal, but it will pump up. Let off the pedal, wait a few seconds and hit it again and goes to the floor. pump the pedal and it will pump up again. It will not have a pedal unless you pump it up. I am lost I have never had a brake system do this----HELP
  • chevynut
    Registered Member
    • Nov 2011
    • 11003

    #2
    Welcome to the site. Did the brakes work correctly before you installed the new calipers? Was it drum brakes before the new calipers? What else did you change in the system?
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

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    • Rick_L
      Registered Member
      • Apr 2012
      • 4676

      #3
      Check to see if the pushrod between the pedal and master cylinder (or booster) has preload. If it does, adjust until the pin goes in without moving the pushrod fore and aft. If you have a booster, check to see if the pushrod between the booster and master cylinder has preload. It should have 1/64" - 1/32" clearance. Either one prevents the master cylinder from getting new fluid from its reservoir. When that happens, you don't expel any air/fluid when you open the bleeder, and the result is the symptom you have.

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      • Randells57
        Registered Member
        • Apr 2018
        • 3

        #4
        It had disc on it before, the system is the same except for the calibers and the braided hoses

        Comment

        • Randells57
          Registered Member
          • Apr 2018
          • 3

          #5
          Thanks I will check that

          Comment

          • NickP
            Registered Member
            • Mar 2012
            • 4158

            #6
            Originally posted by Randells57
            Thanks I will check that
            Bleeders are up top, right?

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