Chevrolet Silverado / GMC Sierra. Service manual — part 2387

Fig. 32: Rear Brake Hose Replacement (Frame to Axle - JF3 w/o JL4, JF7)
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the
Vehicle .

CAUTION:

Refer to Brake Dust Caution .

CAUTION:

Refer to Brake Fluid Irritant Caution .

1

Brake Pipe Fitting

Procedure

1. Remove any dirt or debris from the brake pipe fitting.

2. Cap the brake pipe fitting to prevent brake fluid loss and contamination.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

HYDRAULIC BRAKE SYSTEM BLEEDING (PRESSURE)

Tools Required

J 29532 Diaphragm Pressure Bleeder, or equivalent. See Special Tools.

J 35589-A Brake Pressure Bleeder Adapter. See Special Tools.

Bleeding

Tighten: 25 N.m (18 lb ft)

2

Hose Bracket to Frame Bolt (Qty: 2)

Tighten: 25 N.m (18 lb ft)

3

Brake Pipe Fitting (Qty: 2)

Procedure

1. Remove any dirt or debris from the brake pipe fittings.

2. Cap the brake pipe fittings to prevent brake fluid loss and contamination.

Tighten: 25 N.m (18 lb ft)

4

Hose to Rear Axle Bolt

Tighten: 9 N.m (80 lb in)

5

Rear Brake Hose
Procedure:
Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding
(Pressure) or Hydraulic Brake System Bleeding (Manual).

CAUTION: Refer to Brake Fluid Irritant Caution .

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components
Notice .

NOTE:

When adding fluid to the brake master cylinder reservoir, use only
Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.

2. 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.

3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you

disconnected the brake pipes from the master cylinder, you must perform the following
steps:

1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If

necessary add Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

If removal of the reservoir cap and diaphragm is necessary, clean the outside of the
reservoir on and around the cap prior to removal.

2. With the rear brake pipe installed securely to the master cylinder, loosen and separate

the front brake pipe from the front port of the brake master cylinder.

3. Allow a small amount of brake fluid to gravity bleed from the open port of the master

cylinder.

4. Reconnect the brake pipe to the master cylinder port and tighten securely.

5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on

the pedal.

6. Loosen the same brake pipe to purge air from the open port of the master cylinder.

7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.

8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of

the master cylinder.

9. With the front brake pipe installed securely to the master cylinder, after all air has

been purged from the front port of the master cylinder, loosen and separate the rear
brake pipe from the master cylinder, then repeat steps 3.3-3.8.

10. After completing the final master cylinder port bleeding procedure, ensure that both of

the brake pipe-to-master cylinder fittings are properly tightened.

4. 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.

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.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap
and diaphragm.

5. Install the J 35589-A to the brake master cylinder reservoir. See Special Tools.

6. Check the brake fluid level in the J 29532 , or equivalent. See Special Tools. Add Delco

Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake
fluid from a clean, sealed brake fluid container as necessary to bring the level to
approximately the half-full point.

7. Connect the J 29532 , or equivalent, to the J 35589-A . See Special Tools.

8. Charge the J 29532 , or equivalent, air tank to 175-205 kPa (25-30 psi). See Special Tools.

9. Open the J 29532 , or equivalent, fluid tank valve to allow pressurized brake fluid to enter

the brake system. See Special Tools.

10. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to

ensure that there are no existing external brake fluid leaks.

Any brake fluid leaks identified require repair prior to completing this procedure.

11. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder

valve.

12. Install a transparent hose over the end of the bleeder valve.

13. Submerge the open end of the transparent hose into a transparent container partially filled

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.

14. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow

until air bubbles stop flowing from the bleeder, then tighten the bleeder valve.

15. With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has

been purged from the right rear hydraulic circuit, install a proper box-end wrench onto the
LEFT REAR wheel hydraulic circuit bleeder valve.

16. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.

17. With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air has

been purged from the left rear hydraulic circuit, install a proper box-end wrench onto the
RIGHT FRONT wheel hydraulic circuit bleeder valve.

18. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.

19. With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has

been purged from the right front hydraulic circuit, install a proper box-end wrench onto the
LEFT FRONT wheel hydraulic circuit bleeder valve.

20. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado