ACDelco 20927955 - ABS Pressure Modulator Valve

Signs of Wear & Troubleshooting

• ABS signs of wear include:
• ABS warning light is on, indicating the ABS has been deactivated due to a fault within the system.
• Brake fluid leakage.

• General brake signs of wear include:
• Chirping or grinding noises when braking.
• Difficulty stopping the vehicle.
• A low or sinking brake pedal.
• Brake pedal pulsation (not to be confused with normal ABS operation).
• Vehicle pulls to the left or right when brakes are applied.

Good Maintenance Practices

• The following inspections and maintenance procedures can help prevent potential brake problems.
• Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
• Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
• Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
• Check the thickness of your brake pads.

• The following should be conducted by a qualified technician:
• Inspection of the brake hoses for brittleness or cracking.
• Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
• Inspection of wheel bearings and grease seals.
• Parking brake adjustments (as needed).