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Home >> Cadillac >> 2002 >> DeVille DHS >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes >> System Tests >> Park Brake System Testing >> Heavy Duty Brakes

Heavy Duty Brakes

  1. Were you sent here from a Hydraulic Brake Symptom table? If so, go to step  4 . If not, go to next step.
  2. Were you sent here from a Park Brake Symptom table? If so, go to step  4 . If not, go to next step.
  3. Is the symptom related to the ability of the park brake system to hold and/or release? If so, see DIAGNOSTIC STARTING POINT - PARK BRAKE  under TROUBLE SHOOTING. If not, see DIAGNOSTIC STARTING POINT - HYDRAULIC BRAKE  under TROUBLE SHOOTING.
  4. Raise and support the vehicle with the rear axle supported by jack stands. With the park brake released using the manual override release lever, attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag. Do the rear brakes have a significant amount of drag? If so, go to step  11 . If not, go to next step.
  5. Shift the transmission into Park or Neutral to disable the park brake automatic release system. Apply the park brake. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag. Do the rear brakes have a significant amount of drag? If so, go to next step. If not, go to step  7 .
  6. Release the park brake using the manual override release lever. Rotate the rear wheels to check the rear brakes for a significant reduction in the amount of drag. Did the rear brakes exhibit a significant reduction in the amount of drag? If so, go to step  21 . If not, go to step  11 .
  7. Visually inspect the park brake cable connections and the cables that are accessible on the underside of the vehicle for disconnections and/or damage. Were any or the park brake cables disconnected and/or damaged? If so, go to next step. If not, go to step  9 .
  8. Reconnect or replace the park brake cables as necessary. See PARK BRAKE CABLE  under REMOVAL & INSTALLATION. When finished, go to next step.
  9. Check the adjustment of the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Was the park brake adjusted properly? If so, go to step  11 . If not, hen go to next step.
  10. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Were you able to adjust the park brake? If so, go to step  16 . If not, go to next step.
    11. NOTE: Do not depress the brake pedal with the brake rotors and/or the brake drums removed, or with the brake calipers repositioned away from the brake rotors, or damage to the brake system may result.
  11. Remove the rear brake rotors. See REAR BRAKE ROTOR  under REMOVAL & INSTALLATION. Inspect the park brake shoe hardware for looseness, damaged, broken or missing components. Check the park brake actuators for a seized condition. Does the park brake hardware and/or the park brake actuators require replacement? If so, go to next step. If not, go to step  13 .
  12. Replace park brake hardware components as necessary. See PARK BRAKE SHOE  under REMOVAL & INSTALLATION. Replace the park brake actuators as necessary. See PARK BRAKE ACTUATOR  under REMOVAL & INSTALLATION. When finished, go to next step.
  13. Have an assistant apply and manually release - using the manual override release lever - the park brake, while you observe the park brake cables for free movement. Did the park brake cables move freely? If so, go to next step. If not, go to step  17 .
  14. Check the adjustment of the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Was the park brake adjusted properly? If so, go to step  16 . If not, go to next step.
  15. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Were you able to adjust the park brake? If so, go to next step. If not, go to step  26 .
  16. Perform the following:
    1. With the transmission still in Park or Neutral to disable the park brake automatic release system, apply the park brake.
    2. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
    3. Release the park brake using the manual override release lever.
    4. Rotate the rear wheels to check the rear brakes for a significant reduction of drag.
    Did the park brake apply and release properly? If so, go to step  28 . If not, then return to referencing procedure.
  17. Disconnect the park brake cable connections that are accessible on the underside of the vehicle one at a time and check each cable for free movement. Do any of the park brake cables accessible on the underside of the vehicle require replacement? If so, go to next step. If not, go to step  19 .
  18. Replace any of the park brake cables that do not have free movement. See PARK BRAKE CABLE  under REMOVAL & INSTALLATION. When finished, go to next step.
  19. Disconnect the front park brake cable connection accessible INSIDE the vehicle at the park brake pedal assembly and check for free movement. Replace the front park brake cable if it does not have free movement. See PARK BRAKE CABLE  under REMOVAL & INSTALLATION. Did you find and correct a condition? If so, go to step  24 . If not, go to next step.
  20. Replace the park brake pedal assembly - not releasing properly. See PARK BRAKE PEDAL ASSEMBLY  under REMOVAL & INSTALLATION. When finished, go to step  25 .
  21. Check the adjustment of the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Is the park brake adjusted properly? If so, go to step  28 . If not, go to next step.
  22. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Were you able to adjust the park brake? If so, go to step  27 . If not, go to next step.
  23. Remove the rear brake rotors, if they have not yet been removed. See REAR BRAKE ROTOR  under REMOVAL & INSTALLATION. Check the park brake actuators for a seized condition. Replace the park brake actuators as necessary. See PARK BRAKE ACTUATOR  under REMOVAL & INSTALLATION. Did you find and correct a condition? If so, go to next step. If not, go to step  26 .
  24. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Were you able to adjust the park brake? If so, go to step  27 . If not, go to step  26 .
  25. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Were you able to adjust the park brake? If so, go to step  27 . If not, then return to referencing procedure.
  26. Replace the component that is used to adjust the park brake system. See PARK BRAKE PEDAL ASSEMBLY  under REMOVAL & INSTALLATION. Adjust the park brake. See PARKING BRAKE  under ADJUSTMENTS & INSPECTIONS. Did you complete the replacement and adjustment? If so, go to next step. If not, then return to referencing procedure.
  27. Check the operation of the park brake pedal automatic release system:
    • Apply the park brake.
    • Start the engine and allow it to idle.
    • Shift the transmission into Reverse or any Forward gear.
    • Observe the park brake pedal assembly for automatic release of the pedal.
    Did the park brake assembly release automatically? If so, go to step  30 . If not, go to next step.
  28. Perform the following:
    • Disconnect the park brake release actuator rod from the park brake pedal assembly. Leave the ground wire and the electrical connectors connected to the release actuator.
    • Apply the park brake.
    • Start the engine and allow it to idle.
    • Shift the transmission into Reverse or any Forward gear.
    • Observe the operation of the park brake release actuator rod.
    Did the park brake release actuator operate properly? If so, go to next step. If not, then Park Brake Pedal Automatic Release System is at Fault. Return to referencing procedure.
  29. Replace the park brake pedal assembly - not releasing properly. See PARK BRAKE PEDAL ASSEMBLY  under REMOVAL & INSTALLATION. When finished, go to next step.
  30. Perform the following:
    • With the transmission still in Park or Neutral to disable the park brake automatic release system, apply the park brake.
    • Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
    • Release the park brake using the manual override release lever.
    • Rotate the rear wheels to check the rear brakes for a significant reduction of drag.
    Did the park brake apply and release properly? If so, go to next step. If not, go to step  4 .
  31. Install or connect any components that were removed or disconnected during diagnosis. When finished, return to referencing procedure.
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