Test Descriptions
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.
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Step |
Action |
Yes |
No |
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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. |
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1 |
Were you sent here from the Hydraulic Brake Symptom table? |
Go to Step 2 |
Go to Diagnostic Starting Point - Vehicle |
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2 |
1. 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 2. Adjust, repair or replace components as necessary. Hydraulic Brake System Diagnosis Did you find and correct a condition? |
Go to Step 6 |
Go to Step 3 |
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3 |
1. 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 |
Go to Step 6 |
Go to Step 4 |
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| Step |
Action |
Yes |
No |
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Glazed rotor friction surfaces 2. Adjust, repair or replace components as necessary. Disc Brake System Diagnosis Did you find and correct a condition? |
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| 4 |
1. Inspect the suspension system for the following conditions: Loose suspension component connections Excessively worn or damaged suspension components 2. Adjust, repair or replace components as necessary. Diagnostic Starting Point - Vehicle Did you find and correct a condition? |
Go to Step 6 |
Go to Step 5 |
| 5 |
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 Damaged or improperly operating hydraulic booster, if equipped 2. Adjust, repair or replace components as necessary. Did you find and correct a condition? |
Go to Step 6 |
Go to Diagnostic Starting Point - Vehicle |
| 6 |
1. Install or connect components that were removed or disconnected during diagnosis. 2. Road test the vehicle in order to confirm proper operation. Brake System Vehicle Road Test Is the condition still present? |
Go to Step 2 |
System OK |