Impala V6-3.8L VIN K (2004)
Brake Proportioning/Combination Valve: Service and Repair
Proportioning Valve Replacement
Removal Procedure
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. Remove the master cylinder reservoir.
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.
Installation Procedure