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Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Hydraulic Brake System Bleeding (Manual) >> Bleeding a Single Hydraulic Brake Circuit

Bleeding a Single Hydraulic Brake Circuit

  1. With the ignition OFF and the brakes cool, apply the brakes 3 - 5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
  2. Place a clean shop cloth beneath the brake master cylinder to catch brake fluid spills.
  3. Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
  4. Fill the brake master cylinder reservoir to the maximum-full level with GM approved brake fluid from a clean, sealed brake fluid container. Add brake fluid as needed to ensure that the brake master cylinder reservoir remains at least half-full throughout the bleed procedure. The reservoir cap must be installed at all times except when filling the reservoir. Refer to Fluid and Lubricant Recommendations .
  5. Install a proper box-end wrench onto the wheel hydraulic circuit bleeder valve which has been serviced.
  6. Install a transparent hose over the end of the bleeder valve.
  7. Submerge the open end of the transparent hose into a transparent container partially filled with brake fluid from a clean, sealed brake fluid container.
  8. Have an assistant slowly press the brake pedal fully and maintain steady pressure on the pedal.
  9. Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
  10. Cycle the park brake ON and OFF after opening the bleeder valve on the rear calipers.
  11. Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
  12. Wait 15 seconds, then repeat steps 8-10 until all air is purged from the wheel hydraulic circuit.
  13. Cycle the park brake ON and OFF after opening the bleeder valve on the rear calipers.
  14. After all air has been purged from the hydraulic circuit, tighten the bleeder valve and install the dust cap.
  15. Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
  16. Slowly press and release the brake pedal. Observe the brake pedal feel.
  17. If the brake pedal feels spongy, perform the Bleeding the Complete Brake Hydraulic System procedure:
  18. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
    19. NOTE:

    DO NOT allow the vehicle to be driven until it is diagnosed and repaired.

  19. If the brake system warning lamp remains illuminated, refer to Diagnostic Starting Point - Vehicle .
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