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pressure differential

  1. 1967 Mustang brake proportioning valve/pressure differential valve

    Classic Tech
    I have a 1967 mustang and I have been working on the brake system. There are manual drum brakes all around. There is a problem with the brass valve located by the master cylinder. I heard that the rod inside the valve is supposed to float and move easily, but mine is stuck. Is there some way to...
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