Chevrolet Silverado / GMC Sierra. Service manual — part 2364

BRAKE PEDAL EXCESSIVE EFFORT

components?

Go to Step 8

Go to Step 7

7

1. Inspect the brake assist system for the

following conditions:

Vacuum leaks and/or improperly
operating check valve, if equipped
with vacuum assist

Damaged or improperly operating
brake booster assembly

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 8

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

8

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 pedal requires an increased amount of input from the driver to obtain
good braking action and/or stopping distance is increased.

1

Were you sent here from the Hydraulic Brake
Symptom table?

Go to Step 2

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

1. Inspect the brake assist system for the

following conditions:

Vacuum leaks, if equipped with
vacuum power assist

Lack of lubrication, binding or
excessively worn pushrod or pedal
pivots or pivot bushings

2008 Chevrolet Silverado 1500

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

2

Bent or damaged pedal pushrod,
pedal, or pedal bracket

Damaged or improperly operating
brake booster assembly

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 3

3

1. Inspect the hydraulic brake system for the

following conditions:

Binding caliper pistons

Internally damaged flexible brake
hoses; hindering fluid flow

External brake fluid leaks

Kinked or damaged flexible brake
hoses and/or pipes

Internal brake fluid leaks; improperly
operating master cylinder

Poor brake fluid quality; low boiling
point

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 4

1. Inspect the disc brake system for the

following conditions:

Excessively worn linings

Glazed linings

Cracked, distorted or damaged
linings

Contaminated linings

Binding, damaged or excessively
worn caliper hardware and/or lining
hardware

2008 Chevrolet Silverado 1500

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

BRAKES DRAG

4

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

Excessively worn or corroded rotor
friction surfaces

Glazed rotor friction surfaces

Hard spots, heat checks, blueing
discoloration of rotor friction
surfaces

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

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 system does not fully release or has delayed release; vehicle motion
may be hindered by brake system without applying brakes.

1

Were you sent here from the Hydraulic Brake
Symptom table?

Go to Step 2

Go to Diagnostic
Starting Point -
Hydraulic
Brakes

2

Is the vehicle equipped with an adjustable stop
lamp switch and/or an adjustable cruise control
release switch?

Go to Step 3

Go to Step 4

1. Inspect the stop lamp switch for proper

adjustment to ensure that the brake pedal is
fully releasing.

2008 Chevrolet Silverado 1500

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

3

2. Inspect the cruise control release switch, if

equipped, for proper adjustment to ensure
that the brake pedal is fully releasing.

Did you find and correct a condition?

Go to Step 14

Go to Step 4

4

Is the vehicle equipped with a drum-in-rotor
type of park brake system?

Go to Step 5

Go to Step 7

5

Ensure the park brake shoes are not adjusted too
tightly, possibly causing drag under certain
conditions.
Are the park brake shoes adjusted too tightly?

Go to Step 6

Go to Step 7

6

1. Clean and inspect the park brake shoes for

excessive wear and/or damage.

2. Inspect the drum portion of the rotors for

excessive wear, blueing discoloration and
heat spots.

3. If any of these conditions are present,

replace the affected components.

4. Adjust the park brake system.

Did you find and correct a condition?

Go to Step 14

Go to Step 7

7

Inspect the park brake system for proper
operation. Refer to Park Brake System
Diagnosis .
Did you find and correct a condition?

Go to Step 14

Go to Step 8

8

1. Inspect the disc brake system for the

following conditions:

Binding, incorrectly installed or
missing caliper hardware and/or
lining hardware-Ensure free
movement of linings and of caliper, if
equipped with sliding type caliper

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

Distorted or damaged linings

Damaged or excessively worn caliper

2008 Chevrolet Silverado 1500

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