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Chevrolet Silverado / GMC Sierra. 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
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