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Home >> Buick >> 2018 >> Encore Preferred, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Diagnostic Information and Procedures >> Braking Action Uneven - Front to Rear >> Test Description

Test Description

The number below refers to the step number on the diagnostic table:

  1. 5 

    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 Symptoms - Hydraulic Brakes 
2
  1. Inspect the hydraulic brake system for the following conditions:
    • Improper operation of wheel cylinder pistons, if equipped
    • Improper operation of caliper pistons
    • Kinked, pinched or damaged brake pipe or flexible brake hose
    • Brake fluid leak
    • Improperly functioning proportioning valve, if equipped
    • Improper operation of dynamic rear proportioning (DRP) system, if equipped
  2. Adjust, repair or replace components as necessary. Refer to Hydraulic Brake System Diagnosis .
Did you find and correct a condition?		 Go to Step 7  Go to Step 3 
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
    • Glazed 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 7  Go to Step 4 
4
  1. Inspect the drum brake system for the following conditions.
    • Contaminated linings
    • Improper adjustment
    • Excessively worn or damaged linings
    • Weak or damaged return spring or springs
    • Excessively worn or damaged drums
    • Hard spots, heat checks, blueing discoloration of drum friction surface
    • Distorted or damaged backing plate
  2. Adjust, repair or replace components as necessary. Refer to Drum Brake System Diagnosis .
Did you find and correct a condition?		 Go to Step 7  Go to Step 5 
5 
  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.

    Refer to Symptoms - Suspension General Diagnosis .

Did you find and correct a condition?		 Go to Step 7  Go to Step 6 
6
  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. Refer to Brake Assist System Diagnosis .
Did you find and correct a condition?		 Go to Step 7  Go to Symptoms - Hydraulic Brakes 
7
  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
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