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 TM 9-2320-303-24-1
ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED
0019 00
PRETEST INSPECTION
Prior to performing the tractor test ensure that the daily preventive maintenance inspections and procedures have been
performed on the tractor.
A.
Air Lines
B.
Electrical Lines
1. Cab-Mounted ECU
3.
ABS Modulator Valves
5.
ABS Modulator Valves
2. Wheel Speed Sensors
4.
Relay Valve
6.
Wheel Speed Sensor
Fig 1. Location of ABS Components in the Tractor
GENERAL INFORMATION
1.
Rockwell WABCO ABS E-Version is an electronic system that monitors and controls wheel speed during braking. The
system works with standard air brake systems. ABS monitors wheel speeds at all times and controls braking during
wheel lock situations. The system improves vehicle stability and control by reducing wheel lock during braking.
2.
The ECU receives and processes signals from the wheel speed sensors. When the ECU detects a wheel lockup, the unit
activates the appropriate modulator valve, and air pressure is controlled. In the event of a malfunction in the system, the
ABS in the affected wheel(s) is disabled; that wheel still has normal brakes. The other wheels keep the ABS function.
3.
An ABS warning lamp lets the driver know the status of the system. If the ECU senses a fault during normal vehicle
operation, the ABS warning lamp will come on. This lamp is also used to display blink code diagnostics.
0019 00-2
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