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    Results 1 to 4 of 4
    1. #1
      Join Date
      Aug 2010
      Posts
      440

      Rear brakes not getting pressure?

      I have my Wilwood proportioning valve turned all the way in to get max line pressure to my rear brakes, but I can't seem to be able to get them to lock up. Granted, I have BP30 pads in my Aerolite fronts and BP10 in the FNSL rears. I switched out the 30's I had in the rear because I was getting a weird harmonic vibration sound when rolling to a stop, or moving forward very slowly. The sound went away after the bp10's went in, I can't seem to be able to get the rears to lock up before the fronts on pavement. I know the front pads are much more aggressive, but I thought I could adjust for that with my proportioning valve. I thought the combination would give me the feel I wanted for the street without the increased wear on the rears between track days. Thoughts?
      Joe
      1969 Firebird Project
      1967 Frirebird 400 convertible
      2013 Boss 302

    2. #2
      Join Date
      Apr 2011
      Location
      Rosser Manitoba Canada
      Posts
      338
      Country Flag: Canada
      The prop valve can't increase pressure so the first course of action would be to remove it.

    3. #3
      Join Date
      Oct 2014
      Location
      DFW, Texas
      Posts
      422
      Country Flag: United States
      Bleeder pressure gauges aren't very expensive, I used it to check my Wilwood setup. May be worth trying.
      1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
      1976 Dodge D100 - Warlock
      2016 Subaru WRX - E30 Tune

    4. #4
      Join Date
      Oct 2011
      Posts
      696
      Is it possible that you have your MC lines reversed? I believe pressure is applied to rear brakes first then front that’s why a proportioning valve is needed.







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