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Proportioning Valve: 79-81 Disc x 4 NOS  [1257189]


 Price:  $310.26


Proportioning Valve: 79-81 Disc x 4 NOS

Last of the Genuine factory Proportioning Valves

For Firebirds & Trans Ams from 79-81, Carby or turbo.. with Factory Disc Brake rear end.. fits all the engine sizes, 301,400, 350, 80 Turbo & 403 etc.

  • This is NOT for the Drum brake rear - that one  is listed elsewhere.
  • What does a proportioning valve do?
    A proportioning valve is used in the rear to decrease the rate of pressure rise to the drums relative to the pedal force as weight is shifted to the front during braking. This prevents the rear from locking up under hard braking conditions.
    What are the symptoms of a bad proportioning valve?
    If your prop valve has gone bad your rear wheels will lock up easily, especially on wet surfaces.


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