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Brake pedal "pumps-up"???

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  • Brake pedal "pumps-up"???


    The brake pedal on my '50 Starlight Champion will "pump up" about a half inch if I choose to do this when I apply the brakes. I've bled the brakes, the auto adj's are working as they should, and I checked the adjustment using the ecc. cams. (Outside adjustment.) I have plenty of brake pedal and the car stops straight and true. All the shoes are in good condition with about 2500 miles on them. It's just a little worrisome.

    Dick
    Mountain Home, AR
    http://livingintheozarks.com/studebaker.htm

    Dick
    Mountain Home, AR
    http://www.livingintheozarks.com/studebaker2.htm

  • #2
    I don't think you have a problem, I can pump the brakes up on my brand new truck.As long as you have good pedal and it does not sink when you apply constant pressure.
    Frank van Doorn
    Omaha, Ne.
    1962 GT Hawk 289 4 speed
    1941 Champion streetrod, R-2 Powered, GM 200-4R trans.
    1952 V-8 232 Commander State "Starliner" hardtop OD

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    • #3
      Make sure too that you have the free pedal set correctly. I think it is 3/8 inch at the pedal.

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      • #4
        You still have air in your brake system. Did you bench bleed the master cylinder and the hill holder? If you are using silicone brake fluid, it absorbes air and is very difficult to bleed. A pedal that needs to be pumped up is the main symptom of air in the line.

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        • #5
          quote:Originally posted by whacker
          If you are using silicone brake fluid, it absorbes air and is very difficult to bleed.
          Huh?

          I have used both DOT 5 (silicone) and DOT 3 (glycol) in my Studes. I really can't tell any difference in the ability to bleed, pedal feel, etc.

          I won't start the DOT 5 vs DOT 3 wars here, and silicone fluid has it's downsides, but absorbing air isn't one of them.


          Dick Steinkamp
          Bellingham, WA

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          • #6
            Dick
            If the pedal is hard, you don't have a problem. If it feels like you are stepping on a wet sponge, then there is air in the system. Properly adjusted manual brakes will "pump up" a bit because the fluid from the first pump has not had enough time to completely return to the reservoir so as long as you are satisfied that they are properly adjusted you're good to go. No problems after 2500 miles sounds good to me.

            Terry

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