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power brakes

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  • power brakes

    Installed a power disc brake kit on a 57 with stock 292. It seems to have a lag in the power assist when applying the brake. Anyone else have similar issues?

  • #2
    Are you using the original style Midland remote booster?


    • #3
      Are you talking about the power assist unit under the dash. Did you install a modern booster and master cylinder when you converted to discs. You don't need to use the power assist unit with discs.

      John Pizzi - Squarebirds Administrator

      Thunderbird Registry #36223 856-779-9695


      • #4
        Nope, no lag. What kid did you buy?
        When you apply pedal, that opens a vacuum valve. Push lightly and it opens it slightly. Push hard and the valve immediately opens all the way making it work like a servo valve.

        Are you sure you have the booster set correctly to the M/C?
        Did you properly bench bleed your new M/C?
        Is all air out of the system?
        Are all the firewall/booster/master bolts tight? Any flexing will subtract from pedal response. - Dave
        My latest project:
        CLICK HERE to see my custom hydraulic roller 390 FE build.

        "We've got to pause and ask ourselves: How much clean air do we need?"
        --Lee Iacocca

        From: Royal Oak, Michigan


        • #5
          Make sure you have a large enough vacuum fitting at the intake manifold hose- same size as the fitting to the booster, and the hose should be the correct size as well, and connect directly between the two fittings in a short run with no taps into it.


          • #6
            It was the original type remote booster.


            • #7
              Owner claims it was a Classic Disc brake kit. I actually thought it came from Thunderbird USA.


              • #8
                Check the Midland for vacuum leaks, properly functioning check valve, and re-blead the booster. The Midland units do add boost but they will not be as powerful as our "modern" disk brake cars.


                • #9
                  Finally got back to posting. I had my Midland remote booster rebuilt by Whitepost Restorations and it works well. The core I sent was corroded inside and needed sleeved which is what they specialize in and had no problem with the rebuild. Quick turn around time and a warranty too.