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Home >> Isuzu >> 1993 >> Stylus Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Testing >> Combination Valve

Combination Valve

  1. Ensure master cylinder is full. Raise and support vehicle. Install a bleed hose to a rear bleed screw. Place other end of hose in clean container. Partially fill container with clean brake fluid so end of hose is submerged in fluid. Turn ignition switch to ON position.
  2. Open bleed screw while an assistant slowly depresses brake pedal. Brake warning light should illuminate. Before releasing brake pedal, close bleed screw. If warning light does not illuminate, go to step 4). Reapply brake pedal and ensure warning light goes out.
  3. Attach bleed hose to a front bleed screw. Turn ignition switch to ON position. Open bleed screw while an assistant slowly depresses brake pedal. Brake warning light should illuminate. Before releasing brake pedal, close bleed screw. If warning light does not illuminate, go to next step. Reapply brake pedal and ensure warning light goes out.
  4. If warning light does not illuminate in steps 2) or 3), connect a jumper wire between combination valve wiring connector and ground. If warning light illuminates, warning switch portion of combination valve is faulty. Replace valve, DO NOT disassemble combination valve.
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