OEM GMC Savana 3500 Brake Proportioning Valve

GMC Savana 3500 Brake Proportioning Valve Parts Questions & Experts Answers

• Pressure Metering Valve
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  Q: How to service and repair the Brake Proportioning Valve on GMC Savana 3500?

  A: Service operations on the brake proportioning/combination valve start by writing down the valve identification code for purchasing a replacement. Place the vehicle on safety stands while using a jack for lift support. First detach the retaining bolts from the shield and then remove the shield. First disconnect both the 2-way electrical connector and front and rear brake pipes from the combination valve. The service starts with removing allen bolts which fasten the combination valve to the bpmv then removing the combination valve from the bpmv. Screw the new transfer tubes into the valve while making sure they fit properly before you attach the combination valve to the bpmv. Secure the combination valve to the bpmv using allen bolts by first tightening to 8 nm (6 ft. Lbs.) then securing again to 16 nm (12 ft. Lbs.). After initial tightening to 8 nm (6 ft. Lbs.) install the second torque to 16 nm (12 ft. Lbs.). Tighten the fittings on the combination valve while connecting its brake pipes to the front and rear by using a torque wrench set to 30 nm (22 ft. Lbs.)after completing the necessary tightening procedures the 2-way electrical connector needs to get reinstalled. Put back the shield and fix it using retaining bolts before tightening them to 12 nm (8 ft. Lbs.). Begin bleeding the brake hydraulic system after assuring the metering rod of the combination valve remains depressed. Completion of the combination valve circuit marks the last stage of this procedure.