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Home >> Pontiac >> 2005 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Hydraulic Brake System) >> Repair Instructions >> Proportioning Valve Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Do not wash the proportioning valve in any cleaning solution. The internal components are pre-lubricated with a special grease.
  1. Remove the bracket (1) from the master cylinder.
    2. Fig 1: Locating Master Cylinder Bracket
    GM797046Courtesy of GENERAL MOTORS CORP.
  2. Remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement .
  3. Remove the proportioning valve caps (1).
  4. Remove the O-rings (5).
  5. Remove the springs (2).
  6. Remove the proportioning valve pistons (3). Carefully use needle nose pliers so that you do not damage the piston stems.
  7. Remove the proportioning valve seals (4) from the pistons.
  8. Inspect the proportioning valve pistons for corrosion and deformation. Replace the valve pistons if necessary.
  9. Clean all of the parts in clean, denatured alcohol.
  10. Dry the parts with non-lubricated compressed air.
    11. Fig 2: Proportioning Valve Assembly
    GM176833Courtesy of GENERAL MOTORS CORP.
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