Chevrolet Silverado / GMC Sierra. Service manual — part 2371

5

Clean the brake master cylinder
reservoir using denatured
alcohol, or equivalent, then dry
the reservoir using non-
lubricated, filtered air, or if
necessary, replace the brake
master cylinder reservoir.

Replace the brake master
cylinder reservoir cap
diaphragm.

Front Brake Hose
Replacement (JD9, JF3, JF7)
Front Brake Hose
Replacement (JH6, JH7)

Rear Brake Hose Replacement
(Frame to Axle - JH6, JH7)
Rear Brake Hose Replacement
(Frame to Axle - JD9, JF3
w/JL4)Rear Brake Hose
Replacement (Caliper - JH6,
JH7)Rear Brake Hose
Replacement (Caliper - JD9)
Rear Brake Hose Replacement
(Frame to Axle - JF3 w/o JL4,
JF7)

Front Brake Caliper Overhaul
(JH6, JH7) or Front Brake
Caliper Replacement (JH6,
JH7) Front Brake Caliper
Replacement (JD9, JF3, JF7)

Rear Brake Caliper Overhaul
(JH6, JH7) or Rear Brake
Caliper Replacement (JH6,
JH7) Rear Brake Caliper
Replacement (JD9)

Brake Pressure Modulator
Valve Replacement (JD9, JF3,
JF7) Brake Pressure

-

2008 Chevrolet Silverado 1500

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

Modulator Valve
Replacement (JH6, JH7)

3. If the brake fluid was NOT contaminated

with an oil-based fluid, but WAS
contaminated with water or dirt, rust,
corrosion, and/or brake dust, replace the
brake master cylinder reservoir cap
diaphragm which may have allowed
moisture or dirt to enter the system.

4. Refill and bleed the hydraulic brake system.

Refer to Hydraulic Brake System
Bleeding (Pressure) or Hydraulic Brake
System Bleeding (Manual).

Did you complete the operation and any required
repairs and/or replacements?

Go to Step 9

1. Inspect the following hydraulic brake

system components for external fluid leaks
Repair or replace any of the components
found to be leaking brake fluid. Refer to the
appropriate procedures:

Master Cylinder Replacement
(JD9, JF3, JF7)Master Cylinder
Replacement (JH6, JH7)

Brake master cylinder reservoir cap
diaphragm

Front Brake Hose Replacement
(JD9, JF3, JF7)Front Brake Hose
Replacement (JH6, JH7)

Rear Brake Hose Replacement
(Frame to Axle - JH6, JH7)Rear
Brake Hose Replacement (Frame
to Axle - JD9, JF3 w/JL4)Rear
Brake Hose Replacement (Caliper -
JH6, JH7)Rear Brake Hose
Replacement (Caliper - JD9)Rear

2008 Chevrolet Silverado 1500

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

6

Brake Hose Replacement (Frame
to Axle - JF3 w/o JL4, JF7)

Brake Pipe Replacement

Front Brake Caliper Overhaul
(JH6, JH7) or Front Brake Caliper
Replacement (JH6, JH7) Front
Brake Caliper Replacement (JD9,
JF3, JF7)

Rear Brake Caliper Overhaul
(JH6, JH7) or Rear Brake Caliper
Replacement (JH6, JH7) Rear
Brake Caliper Replacement (JD9)

Brake Pressure Modulator Valve
Replacement (JD9, JF3, JF7)
Brake Pressure Modulator Valve
Replacement (JH6, JH7)

2. If you repaired or replaced any of the brake

system components listed, bleed the
hydraulic brake system. Refer to Hydraulic
Brake System Bleeding (Pressure) or

Hydraulic Brake System Bleeding
(Manual)

. While bleeding the hydraulic

brake system, observe for the following
conditions:

The presence of air in the system at a
bleeder valve location other than at
the repair location, except if the brake
master cylinder was replaced

An unrestricted and even flow of
brake fluid per axle during the
bleeding procedure

Did you find and correct a condition?

Go to Step 7

Go to Step 12

7

Was there air in the system at a bleeder valve
location other than at the repair location, except
if the brake master cylinder was replaced?

Go to Step 19

Go to Step 8

8

Was the flow of brake fluid unrestricted and even

2008 Chevrolet Silverado 1500

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

per axle during the bleeding procedure?

Go to Step 9

Go to Step 10

9

Inspect the hydraulic function of the brake
calipers for proper operation. Refer to
Hydraulic Brake Component Operation
Visual Inspection.
Was the hydraulic function of the brake calipers
operating properly?

Go to Step 21

Go to Step 14

10

Was the flow of brake fluid restricted or uneven
through front axle hydraulic components during
the bleeding procedure?

Go to Step 13

Go to Step 11

11

Was the flow of brake fluid restricted or uneven
through rear axle hydraulic components during
the bleeding procedure?

Go to Step 17

-

12

Inspect the hydraulic function of the brake
calipers for proper operation. Refer to
Hydraulic Brake Component Operation
Visual Inspection.
Was the hydraulic function of the brake calipers
operating properly?

Go to Step 15

Go to Step 13

13

Determine if the brake caliper is restricting the
flow of brake fluid and/or not operating
properly:

1. Raise and support the vehicle. Refer to

Lifting and Jacking the Vehicle .

2. Remove the tire and wheel assemblies.

Refer to Tire and Wheel Removal and
Installation .

3. Open the suspected caliper bleeder valve.

4. Using a large C-clamp, compress the caliper

piston and observe for an unrestricted flow
of brake fluid and for free movement of the
caliper piston.

5. Close the caliper bleeder valve.

Was the flow of brake fluid unrestricted and did
the caliper piston move freely?

Go to Step 17

Go to Step 14

2008 Chevrolet Silverado 1500

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