Step
| Action
| Yes
| No
|
DEFINITION:
| • | Fluctuation or pulsation is felt through the brake pedal, steering wheel, seat, floor, and/or in the vehicle ONLY when braking. |
| • | Notchy or uneven brake pedal feel during brake apply. |
| • | Kickback is felt through the brake pedal during brake apply and release. |
|
1
| Were you sent here from the Hydraulic Brake Symptom table?
| Go to Step 2
| Go to Symptoms - Hydraulic Brakes
|
2
|
- Inspect the disc brake system for the following conditions:
| • | Excessive thickness variation of disc friction surfaces |
| • | Excessive assembled lateral runout (LRO) of disc friction surfaces |
| • | Hard spots, heat checks, bluing discoloration of disc friction surfaces; possibly due to brake drag |
| • | Excessive corrosion of disc friction surfaces; including red, gray or black oxidation |
| • | Loose, damaged or missing calliper or lining hardware |
| • | Bent or damaged calliper or mounting component |
| • | Excessive LRO of wheel hub/axle flange; due to damage and/or loose or excessively worn bearings |
- Perform the disc brake system diagnostic procedure. Refer to Disc Brake System Diagnosis .
- Adjust, repair or replace components as necessary.
Did you find and correct a condition?
| Go to Step 8
| Go to Step 3
|
3
|
- Inspect the brake hydraulic and assist systems for the following conditions:
| • | Lack of lubrication, binding, excessively worn and/or damaged brake pedal pushrod, pin and/or pedal pivot bushings. |
| • | Bent or damaged pedal pushrod, pedal, or pedal bracket. |
| • | Restricted brake master cylinder reservoir-to-brake pressure modulator valve (BPMV) feed and/or return hoses. |
- Perform the entire brake and hydraulic assist system diagnostic procedure. Refer to Brake Hydraulic and Assist System Diagnosis .
- Adjust, repair or replace components as necessary.
Did you find and correct a condition?
| Go to Step 8
| Go to Step 4
|
4
| Does the brake pedal feel notchy or uneven during brake apply?
| Go to Step 6
| Go to Step 5
|
5
| Is kickback felt through the brake pedal during brake apply and release?
| Go to Step 7
| Go to Symptoms - Hydraulic Brakes
|
6
|
- Replace the brake master cylinder for sticking or improperly functioning pistons. Refer to Master Cylinder Replacement .
- Pressure bleed the hydraulic brake system. Refer to
Hydraulic Brake System Bleeding : Pressure .
- Perform the entire Antilock Brake System Automated Bleed .
Did you find and correct a condition?
| Go to Step 8
| Go to Symptoms - Hydraulic Brakes
|
7
|
- Replace the brake pressure modulator valve (BPMV) for an improperly functioning boost circuit. Refer to Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement .
- Pressure bleed the hydraulic brake system. Refer to
Hydraulic Brake System Bleeding : Pressure .
- Perform the entire Antilock Brake System Automated Bleed .
Did you find and correct a condition?
| Go to Step 8
| Go to Symptoms - Hydraulic Brakes
|
8
|
- 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
|
