Test Descriptions
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 4:
Suspension components that are not operating properly may cause a disturbance to the vehicle during application of the brake system.
| Step |
Action |
Yes |
No |
| DEFINITION: Braking action or stopping force sensitive or grabbing and/or more pronounced at the front or at the rear axle. Sensitive or grabbing brakes: Excessive brake jump-in force relative to brake pedal input. |
| 1 |
Were you sent here from the Hydraulic Brake Symptom table? |
Go to Step 2 |
Go to Diagnostic Starting Point - Hydraulic Brakes |
| 2 |
- Inspect the hydraulic brake system for the following conditions:
- Improper operation of caliper pistons
- Kinked, pinched or damaged brake pipe or flexible brake hose
- Brake fluid leak
- Improperly functioning proportion valve, if equipped
- Improper operation of dynamic rear proportion (DRP) system, if equipped
- Adjust, repair or replace components as necessary. Refer to Hydraulic Brake System Diagnosis .
Did you find and correct a condition? |
Go to Step 6 |
Go to Step 3 |
| 3 |
- Inspect the disc brake system for the following conditions:
- Contaminated linings
- Glazed linings
- Distorted, cracked or damaged linings
- Excessively worn linings
- Aftermarket linings
- Damaged or excessively worn caliper hardware and/or lining hardware
- Hard spots, heat checks, blueing discoloration of rotor friction surfaces
- Glazed rotor friction surfaces
- Adjust, repair or replace components as necessary. Refer to Disc Brake System Diagnosis .
Did you find and correct a condition? |
Go to Step 6 |
Go to Step 4 |
| 4 |
- Inspect the suspension system for the following conditions:
- Loose suspension component connections
- Excessively worn or damaged suspension components
- Adjust, repair or replace components as necessary. Refer to Diagnostic Starting Point - Suspension General Diagnosis
.
Did you find and correct a condition? |
Go to Step 6 |
Go to Step 5 |
| 5 |
- 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
- Damaged or improperly operating hydraulic booster, if equipped
- 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 6 |
Go to Diagnostic Starting Point - Hydraulic Brakes |
| 6 |
- Install or connect components that were removed or disconnected during diagnosis.
- 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 |