C 1500 Truck 2WD V8-6.5L DSL Turbo VIN S (1997)
Brake Proportioning/Combination Valve: Service and Repair
Combination Valve
NOTE: Prior to replacement of the combination valve, note the identification code on the valve. It is necessary to have the proper code when ordering a
replacement valve.
Remove or Disconnect
1. Electrical connector.
2. Front and rear brake pipes.
3. Three Allen bolts.
4. Combination valve from Brake Pressure Modulator Valve (BPMV).
5. Two transfer tubes.
NOTE:
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Do not reuse the transfer tubes. Always install new transfer tubes with a new combination valve.
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Verify that the replacement combination valve has the same pin punched identification code as previously noted on the old part.
Install or Connect
1. Two new transfer tubes into the combination valve. Ensure tubes are fully seated.
2. Combination valve to BPMV.
3. Three combination valve bolts. Tighten bolts in two steps:
a. Tighten first to 8 Nm (6 lb. ft.).
b. Tighten next to 16 Nm (12 lb. ft.).
4. Front and rear brake pipes to combination valve.
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Tighten brake pipe fittings to 24 Nm (18 lb. ft.).
5. Electrical connector.
6. Bleed the system. Refer to Hydraulic System, Bleeding Procedures.
NOTE: Verify that the combination valve metering rod is depressed during bleeding.