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Brake Assist System Testing

  1. If you were sent here from SYMPTOMS - HYDRAULIC BRAKE  , go to next step. If you were not sent here from SYMPTOMS - HYDRAULIC BRAKE  , see DIAGNOSTIC STARTING POINT - HYDRAULIC BRAKES  under TROUBLE SHOOTING.
  2. Inspect for proper brake pedal travel. See BRAKE PEDAL TRAVEL AND MEASUREMENT  under TROUBLE SHOOTING. Is the brake pedal travel distance within the specifications? If so, go to step  5 . If not, go to next step.
  3. Inspect for worn, missing, misaligned, bent or damaged brake pedal system components.
    • For the brake pedal pushrod component inspection, see BRAKE PEDAL PUSHROD INSPECTION  under ADJUSTMENTS & INSPECTIONS.
    • Inspect the brake pedal bushings for excessive wear and/or damage and inspect the brake pedal for a misaligned, bent and/or damaged condition.
    Replace the brake pedal system components that are worn, missing, misaligned, bent or damaged, refer to the following procedures as necessary.
    • Brake Pedal Replacement
    • Power Brake Booster Replacement in order to replace a bent or damaged pedal pushrod.
    See REMOVAL & INSTALLATION  . Did you find and replace any worn, missing, misaligned, bent or damaged brake pedal system components? If so, go to next step. If not, go to step  5 .
  4. Reinspect for proper brake pedal travel. See BRAKE PEDAL PUSHROD INSPECTION  under ADJUSTMENTS & INSPECTIONS. Is the brake pedal travel distance within the acceptable limits? If so, go to step  8 . If not, go to next step.
  5. Check the engine vacuum source that supplies vacuum to the power brake booster. Replace components as necessary. See BRAKE SYSTEM VACUUM SOURCE TEST  . Did you replace any components? If so, go to next step. If not, go to step  12 .
  6. During the vacuum source inspection, did the vacuum booster check valve operate properly? If so, go to step  8 . If not, go to next step.
  7. Replace the power brake booster. See POWER BRAKE BOOSTER  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  8. Pump the brake pedal several times in order to exhaust the vacuum from the booster. Maintain moderate foot pressure on the brake pedal and start the engine. Did the brake pedal drop slightly, then remain firm after the engine was started? If so, go to next step. If not, go to step  11 .
  9. Release the brake pedal. Turn the ignition OFF, then wait 15 seconds. If operating properly, the power brake booster should maintain assist for at least two pedal applications. Pump the brake pedal 2 times in order to check for available vacuum reserve and in order to observe brake pedal effort. Did the brake pedal effort increase significantly? If so, go to step  11 . If not, go to next step.
  10. Inspect the brake pedal pushrod and the brake pedal for misalignment, a bent condition and/or damage. Is the brake pedal pushrod and/or the brake pedal misaligned, bent or damaged? If so, go to next step. If not, go to step  12 .
  11. Replace the brake pedal pushrod and/or the brake pedal, as necessary. Refer to the following procedures:
    • Brake Pedal Replacement
    • Power Brake Booster Replacement in order to replace a bent or damaged pedal pushrod.
    See REMOVAL & INSTALLATION  . Did you complete the replacement? If so, go to next step.
  12. Install or connect any components that were removed or disconnected during diagnosis. Is the operation complete? If so, then system okay. If system is not okay, go to step  2 .
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