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Home >> GMC >> 2002 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Combination Valve Replacement >> Installation Procedure

Installation Procedure

IMPORTANT: Do not reuse the transfer tubes. Always install new transfer tubes with a new combination valve.
Verify that the replacement combination valve has the same pin punched identification code as the code found on the old part.
    Fig 1: Combination Valve & BPMV
    GM184208Courtesy of GENERAL MOTORS CORP.
  1. Install 2 new transfer tubes (13) into the combination valve until fully seated.
  2. Install combination valve (12) to BPMV.
    3. NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install 3 combination valve bolts (11).

    Tighten:  Tighten bolts first to 8 N.m (6 lb ft), then to 16 N.m (12 lb ft).

  4. Install the front and rear brake pipes to combination valve.

    Tighten:  Tighten brake pipe fittings to 25 N.m (18 lb ft).

  5. Connect the electrical connector to the combination valve.
    6. IMPORTANT: Verify that the combination valve metering rod is depressed during bleeding.
  6. Bleed the brake system. Refer to Hydraulic Brake System Bleeding (Manual)  or Hydraulic Brake System Bleeding (Pressure) .
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