Chevrolet Silverado / GMC Sierra. Service manual — part 2365

hardware and/or lining hardware

Bent or damaged caliper or mounting
component

2. Adjust, repair or replace components as

necessary. Refer to Disc Brake System
Diagnosis.

Did you find and correct a condition?

Go to Step 14

Go to Step 9

9

1. Separate the brake booster pushrod from

the brake pedal.

2. Inspect the brake corners to determine if

the brake drag condition is still present.

Do the brake corners still exhibit the brake drag
condition?

Go to Step 11

Go to Step 10

10

1. Inspect the pushrod for improper

positioning and/or damage. Correctly
position or replace the pushrod if
necessary.

2. Inspect the brake pedal assembly for

damage and replace if necessary.

Did you complete the repair or replacement?

Go to Step 14

-

11

1. For vacuum boost systems, disconnect the

vacuum check valve from the booster to
relieve vacuum reserve.

2. Separate the master cylinder from the

brake booster. Do not disconnect any
brake pipes.

3. Inspect the brake corners to determine if

the brake drag condition is still present.

Do the brake corners still exhibit the brake drag
condition?

Go to Step 13

Go to Step 12

12

Replace the brake booster assembly.
Did you complete the replacement?

Go to Step 14

-

1. Inspect the hydraulic brake system for the

2008 Chevrolet Silverado 1500

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

BRAKE SYSTEM SLOW RELEASE

13

following conditions.

Improper operation of caliper pistons

Contaminated brake fluid

Internally damaged flexible brake
hoses; hindering brake release

Damaged or improperly operating
master cylinder

2. Adjust, repair or replace components as

necessary. Refer to Hydraulic Brake
System Diagnosis.

Did you find and correct a condition?

Go to Step 14

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

14

1. Install or connect components that were

removed or disconnected during diagnosis.

2. Road test the vehicle in order to confirm

proper operation. Refer to Brake System
Vehicle Road Test.

Is the condition still present?

Go to Step 2

System OK

Step

Action

Yes

No

DEFINITION: Brake system releases and returns to rest slowly; vehicle motion is hindered
by brake system briefly after release of brake pedal.

1

Were you sent here from the Hydraulic Brake
Symptom table?

Go to Step 2

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

2

1. Inspect the hydraulic brake system for the

following conditions:

Improper operation of caliper pistons

Internally damaged flexible brake
hoses; hindering brake release

Contaminated brake fluid

Damaged or improperly operating

2008 Chevrolet Silverado 1500

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

master cylinder

2. Adjust, repair or replace components as

necessary. Refer to Hydraulic Brake
System Diagnosis.

Did you find and correct a condition?

Go to Step 5

Go to Step 3

3

1. Inspect the brake assist system for the

following conditions:

Binding, bent or damaged pedal
pushrod, pedal, or pedal bracket

Damaged or improperly operating
vacuum booster, if equipped

Restricted return hose from hydraulic
booster, if equipped

Damaged or improperly operating
hydraulic booster, if equipped

2. Adjust, repair or replace components as

necessary. Refer to Brake Assist System
Diagnosis (Hydraulic Assist).

Did you find and correct a condition?

Go to Step 5

Go to Step 4

4

1. Inspect the disc brake system for the

following conditions:

Damaged or excessively worn caliper
hardware and/or lining hardware

Distorted or damaged linings

Lack of lubrication or excessive
corrosion on metal to metal contact
surfaces

Bent or damaged caliper or mounting
component

2. Adjust, repair or replace components as

necessary. Refer to Disc Brake System
Diagnosis.

Did you find and correct a condition?

Go to Step 5

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

2008 Chevrolet Silverado 1500

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

BRAKE FLUID LOSS

5

1. Install or connect components that were

removed or disconnected during diagnosis.

2. Road test the vehicle in order to confirm

proper operation. Refer to Brake System
Vehicle Road Test.

Is the condition still present?

Go to Step 2

System OK

Step

Action

Yes

No

DEFINITION: Brake fluid level is low not related to lining wear.

1

Were you sent here from the Hydraulic Brake
Symptom table?

Go to Step 2

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

2

1. Inspect the following hydraulic brake

system components for brake fluid leaks:

Flexible brake hose connections;
threaded and bolted

Flexible brake hose crimp joints

Brake pipe fittings

Caliper piston seals

Wheel cylinder piston seals, if
equipped

Master cylinder reservoir

Master cylinder reservoir low
pressure hose, if equipped

Brake pressure modulator valve
(BPMV) assembly, if equipped

2. Repair or replace components as necessary.

Refer to Hydraulic Brake System
Diagnosis.

Did you find and correct a condition?

Go to Step 8

Go to Step 3

3

Is the vehicle equipped with a vacuum brake

2008 Chevrolet Silverado 1500

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