Service Information

Volt

Symptoms - Hydraulic Brakes

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

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 familiarise yourself with the system functions. Refer to the following:

•	Hydraulic Brake System Description and Operation

•	Brake System, Hydraulic, Assist, and Control Description and Operation

•	Hydraulic Brake Component Operation Visual Inspection

•	Inspect for aftermarket devices which could affect the operation of the Hydraulic Brake System. Refer to Checking Aftermarket Accessories .

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

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

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

•	Brake Pulsation

•	Brake System Noise

•	Braking Action Uneven - Pulls to One Side

•	Braking Action Uneven - Front to Rear

•	Brake Pedal Excessive Travel

•	Brake Pedal Excessive Effort

•	Brakes Drag

•	Brake System Slow Release

•	Brake Fluid Loss

•	Brake Hydraulic and Assist System Diagnosis