Symptoms - Hydraulic Brake: Notes

1. Perform DIAGNOSTIC SYSTEM CHECK  before using the hydraulic brake symptom tables in order to verify that all of the following are true:
   • There are no DTCs set.
   • The control modules can communicate via the serial data link.
2. Perform the Brake System Vehicle Road Test before using the hydraulic brake symptom tables in order to duplicate the customer's concern. See BRAKE SYSTEM VEHICLE ROAD TEST  under TROUBLE SHOOTING.

Inspect for aftermarket devices which may affect the operation of the brake warning system. Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.

Faulty electrical connections or wiring may be the cause of intermittent conditions.