Initial Inspection and Diagnostic Overview

A visual inspection consists of physically looking for the possible cause of a malfunction. A careful and thorough visual inspection of components may quickly identify the cause of a malfunction and eliminate the need for diagnostic testing.

PERFORM THE FOLLOWING VISUAL INSPECTIONS BEFORE DOING ANY DIAGNOSTIC TESTING. If a malfunction is not resolved by the visual inspection, proceed with diagnostic testing.

(System Component Locations) for pictures identifying the location of system components.

BRAKE FLUID LEVEL
- Visually inspect for the proper fluid level within the fluid reservoir.

HYDRAULIC CONTROL UNIT
- Visually inspect the hydraulic assemblies for leaks and for damaged or disconnected connectors.

FUSES
- Visually inspect that all fuses are properly installed.

WHEEL SPEED SENSOR CONNECTORS
- Visually inspect both front wheel speed sensor connectors for damage or disconnection. Inspect the rear axle speed sensor connectors.

BRAKE FLUID LINES
- Visually inspect brake fluid lines for any leaks or damage.

WHEEL SPEED SENSORS
- Visually inspect all three wheel speed sensors and tone wheels for any damage.

CONTROLLER ANTILOCK BRAKE (CAB)
- Visually inspect the CAB for a secure mounting and the CAB connector for damage or loose connection.

BASE BRAKE SYSTEM
- Visually inspect the condition of the parking brake, rotors, drums, and calipers.