Chevrolet Silverado / GMC Sierra. Service manual — part 723

4. Using the scan tool, begin the automated bleed procedure.

5. Follow the instructions on the scan tool to complete the automated bleed procedure. Release

the brake pedal between each test sequence.

6. Turn the ignition OFF.

7. Remove the scan tool from the vehicle.

8. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11®,

GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean,
sealed brake fluid container.

9. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Pressure)

or Hydraulic Brake System Bleeding (Manual) .

10. 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.

11. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.

12. 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. Refer to Brake System External Leak Inspection .

13. Turn the ignition key ON, with the engine OFF; check to see if the brake system warning

lamp remains illuminated.

14. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be

driven until it is diagnosed and repaired. Refer to Symptoms - Hydraulic Brakes .

15. Drive the vehicle to exceed 13 km/h (8 mph) to allow ABS initialization to occur. Observe

brake pedal feel.

16. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake

pedal is obtained.

ELECTRONIC BRAKE CONTROL MODULE REPLACEMENT (JH6, JH7)

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 5: View Of Electronic Brake Control Module & Screws
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedures

1. Turn the ignition switch to the OFF position.

2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

3. Remove any dirt and debris from the area of the brake pressure modulator valve

(BPMV)/electronic brake control module (EBCM) assembly.

NOTE:

Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the
ignition switch in the OFF position. Failure to observe this precaution could result in damage to the
EBCM/EBTCM.

EBCM to BPMV Screw (Qty: 4)

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

ELECTRONIC BRAKE CONTROL MODULE REPLACEMENT (JD9, JF3, JF7)

1

Procedure

1. Discard the EBCM to BPMV screws.

2. Install new EBCM to BPMV screws.

3. Tighten the EBCM to BPMV screws in an X pattern.

Tighten: 3 N.m (27 lb in)

2

Electronic Brake Control Module (EBCM)

Procedure

1. Disconnect the EBCM electrical connector.

2. Carefully pull the EBCM away from the BPMV. Do not force the

components apart.

3. Clean the EBCM to BPMV sealing surfaces with denatured alcohol and

allow to dry.

4. Program the EBCM. Refer to Control Module References .

5. Bleed the antilock brake system. Refer to Antilock Brake System

Automated Bleed Procedure (With JL4) or Antilock Brake System
Automated Bleed Procedure (Without JL4).

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 6: View Of Electronic Brake Control Module & Screws
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedures

1. Turn the ignition switch to the OFF position.

2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

3. Remove any dirt and debris from the area of the brake pressure modulator valve

(BPMV)/electronic brake control module (EBCM) assembly.

NOTE:

Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the
ignition switch in the OFF position. Failure to observe this precaution could result in damage to the
EBCM/EBTCM.

1

EBCM to BPMV Screw (Qty: 4)

Procedure

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado