Important: The following steps must be completed before using the symptom tables.
- Perform 
Diagnostic System Check - Hydraulic Brakes 
  before using the hydraulic brake symptom tables in order
to verify that all of the following are true:
 
| •  | The control modules can communicate via the serial data link. | 
 
- Perform the 
Brake System Vehicle Road Test 
 before using the hydraulic brake symptom tables in order
to duplicate the customer's concern.
 
- Review the system operation in order to familiarize yourself with
the system functions. Refer to the following:
 
Visual/Physical Inspection
|     •  | Inspect the easily accessible or visible system components for
obvious damage or conditions which may cause the symptom. | 
 
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: