GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Proportioner Valve

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REMOVAL & INSTALLATION



The proportioner valve is not repairable; if any fault is present, it must be replaced as a complete assembly. The use of rubber hoses or hydraulic lines not specifically listed for use with DM ABS-III may lead to system problems requiring major repairs.

  1. Depressurize the Powermaster III unit.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and safely support vehicle.
  6.  
  7. Disconnect the input brake line (12mm) and the 2 output brake lines (10mm) from the proportioner valve.
  8.  
  9. Remove the proportioner valve.
  10.  

To install:
  1. When reinstalling, place the proportioner valve so that the rub pad is against vehicle body.
  2.  
  3. Connect the input and output brake lines to the valve. Tighten the nuts to 15 ft. lbs (17 Nm).
  4.  
  5. Lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Properly bleed the system. Only the rear brake circuits require bleeding.
  10.  

 
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