Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Bleeding the ABS System

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WARNING
When adding fluid to the brake master cylinder reservoir, use only DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.


WARNING
Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid.


NOTE
The base hydraulic brake system must be bled before performing this automated bleeding procedure. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual before proceeding.

  1. Connect a scan tool to the vehicle-s Data Link Connector (DLC).
  2.  
  3. Start the engine and allow the engine to idle.
  4.  
  5. Depress the brake pedal firmly and maintain steady pressure on the pedal.
  6.  
  7. Using the scan tool, begin the automated bleed procedure.
  8.  
  9. Follow the instructions on the scan tool to complete the automated bleed procedure. Release the brake pedal between each test sequence.
  10.  
  11. Turn the ignition OFF .
  12.  
  13. Remove the scan tool from the vehicle.
  14.  
  15. Fill the brake master cylinder reservoir to the maximum-fill level with DOT-3 brake fluid from a clean, sealed brake fluid container.
  16.  
  17. Bleed the hydraulic brake system. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual.
  18.  
  19. With the ignition OFF , apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster power reserve.
  20.  
  21. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
  22.  
  23. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure inspect the brake system for external leaks.
  24.  
  25. Turn the ignition key ON but DO NOT start the engine; check to see if the brake system warning lamp remains illuminated.
  26.  
  27. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
  28.  
  29. Drive the vehicle to exceed 8 mph (13 kph) to allow ABS initialization to occur. Observe brake pedal feel.
  30.  
  31. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
  32.  


NOTE
A Scan Tool is required to perform the following procedure.

  1. Raise the vehicle in order to access the system bleed screws.
  2.  
  3. Bleed the system at the right rear wheel first.
  4.  
  5. Install a clear hose on the bleed screw.
  6.  
  7. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid.
  8.  
  9. Open the bleed screw 1 / 2 to one full turn.
  10.  
  11. Slowly depress the brake pedal. While the pedal is depressed to its full extent, tighten the bleed screw.
  12.  
  13. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to return to the home position.
  14.  
  15. Repeat the previous steps for the remaining wheels. The brake fluid which is present at each bleed screw should be clean and free of air.
  16.  
  17. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry.
  18.  
  19. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure. Release the brake pedal between each test.
  20.  
  21. Bleed all four wheels again. This will remove the remaining air from the brake system.
  22.  
  23. Evaluate the feel of the brake pedal before attempting to drive the vehicle.
  24.  
  25. Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal.
  26.  


WARNING
When adding fluid to the brake master cylinder reservoir, use only DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.


WARNING
Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid.


NOTE
The base hydraulic brake system must be bled before performing this automated bleeding procedure. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual before proceeding.

  1. Connect a scan tool to the vehicle-s Data Link Connector (DLC).
  2.  
  3. Start the engine and allow the engine to idle.
  4.  
  5. Depress the brake pedal firmly and maintain steady pressure on the pedal.
  6.  
  7. Using the scan tool, begin the automated bleed procedure.
  8.  
  9. Follow the instructions on the scan tool to complete the automated bleed procedure. Release the brake pedal between each test sequence.
  10.  
  11. Turn the ignition OFF .
  12.  
  13. Remove the scan tool from the vehicle.
  14.  
  15. Fill the brake master cylinder reservoir to the maximum-fill level with DOT-3 brake fluid from a clean, sealed brake fluid container.
  16.  
  17. Bleed the hydraulic brake system. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual.
  18.  
  19. With the ignition OFF , apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster power reserve.
  20.  
  21. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
  22.  
  23. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure inspect the brake system for external leaks.
  24.  
  25. Turn the ignition key ON but DO NOT start the engine; check to see if the brake system warning lamp remains illuminated.
  26.  
  27. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
  28.  
  29. Drive the vehicle to exceed 8 mph (13 kph) to allow ABS initialization to occur. Observe brake pedal feel.
  30.  
  31. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
  32.  


WARNING
When adding fluid to the brake master cylinder reservoir, use only DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.


WARNING
Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid.


NOTE
The base hydraulic brake system must be bled before performing this automated bleeding procedure. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual before proceeding.

  1. Connect a scan tool to the vehicle-s Data Link Connector (DLC).
  2.  
  3. Start the engine and allow the engine to idle.
  4.  
  5. Depress the brake pedal firmly and maintain steady pressure on the pedal.
  6.  
  7. Using the scan tool, begin the automated bleed procedure.
  8.  
  9. Follow the instructions on the scan tool to complete the automated bleed procedure. Release the brake pedal between each test sequence.
  10.  
  11. Turn the ignition OFF .
  12.  
  13. Remove the scan tool from the vehicle.
  14.  
  15. Fill the brake master cylinder reservoir to the maximum-fill level with DOT-3 brake fluid from a clean, sealed brake fluid container.
  16.  
  17. Bleed the hydraulic brake system. Refer to Bleeding the Brake System procedure in the Brake Operating System section of this manual.
  18.  
  19. With the ignition OFF , apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster power reserve.
  20.  
  21. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
  22.  
  23. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure inspect the brake system for external leaks.
  24.  
  25. Turn the ignition key ON but DO NOT start the engine; check to see if the brake system warning lamp remains illuminated.
  26.  
  27. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
  28.  
  29. Drive the vehicle to exceed 8 mph (13 kph) to allow ABS initialization to occur. Observe brake pedal feel.
  30.  
  31. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
  32.  

 
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