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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 808 (Antilock Brake System With TCVS & VSES) >> Diagnostic Information and Procedures >> Brake Pressure Modulator Valve Hydraulic Testing >> Dump and Isolation Valve Testing >> Pressure Dump Test Procedure

Pressure Dump Test Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Apply the parking brake fully.
  2. Start the engine and allow the engine to idle.
  3. Select the desired Dump Valve Solenoid Test on the scan tool.
  4. Apply the brake and maintain steady pressure on the brake pedal.
  5. Command the solenoid On and verify that the brake pedal drops to the floor.
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