For 1990-2009 cars

Important: The following steps must be completed before using the symptom tables.

1. Perform Diagnostic System Check - Hydraulic Brakes before using the symptom tables in order to verify that all of the following are true:

• | There are no DTCs set.

• | The control module(s) can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:

• | Master Cylinder Description

• | Vacuum Brake Booster Description

• | Brake Warning System Operation

• | Brake Warning System Circuit Description

### Visual/Physical Inspection

• | Inspect for aftermarket devices which may affect the operation of the instrument panel cluster. Refer to Checking Aftermarket Accessories in Wiring Systems.

• | Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.

• | Inspect the master cylinder reservoir for the proper brake fluid level.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Brake Pulsation

• | BRAKE Indicator Inoperative

• | Brake Pedal Excessive Travel

• | Brake Pedal Travel Gradually Increases

• | Brake Pedal Excessive Effort to Stop

• | Brake Pulsation

• | Brake System Slow Response

• | Brake System Slow Release

• | Brakes Drag

• | Braking Action Uneven - Side to Side

• | Braking Action Uneven - Front to Rear

• | Brake System Noise with Brakes Applied

• | Brake System Noise with Brakes Not Applied

• | External Conditions that Affect Brake Performance

• | Brake System Testing

• | Brake Pedal Travel

• | Brake Fluid Leak