C 1500 Truck 2WD V6-4.3L VIN W (1996)
Brake Proportioning/Combination Valve: Service and Repair
Fig. 228 Combination Valve Replacement.
1. Disconnect battery ground cable, then raise and support vehicle.
2. Remove bolts securing shield (if equipped) and Brake Pressure Modulator Valve (BPMV) to EHCU bracket.
3. Disconnect combination valve electrical connector, then the front and rear brake pipes.
Prevent fluid spillage with clean shop towels.
4. Remove bolts securing combination valve to BPMV, Fig. 228, then separate valve from BPMV.
5. Reverse procedure to install, noting the following:
a. Torque combination valve mounting bolts alternately to 6 ft. lbs., then to 12 ft. lbs.
b. Torque brake pipe fittings to 18 ft. lbs.
c. Bleed brake system. Refer to Brakes / Service and Repair / Bleeding Brakes. See: Service and Repair
Ensure combination valve metering rod is depressed during bleeding.
