SECTION III.1. TROUBLESHOOTING AND TESTING THE ANTI-LOCK
BRAKE SYSTEM WITH PRO-LINK
This section contains information on troubleshooting and testing the Anti-Lock Brake System (ABS) using
Pro-Link. The ABS is an electronic system that monitors and controls wheel speed at all times, and controls
braking only during emergency situations. The ABS controls the braking of each whee separately, which
prevents wheel locking, maintains steerability, and reduces stopping distance. The ABS has two diagonal
circuits. Each circuit connects the front wheel of one side of the tractor to the rear wheels of the opposite side.
In case of a system fault, only half of the ABS stops working. Control of that half is returned to the standard
brake system. The ABS uses a tooth wheel and sensor on me hub of each monitored wheel The sensor sends
wheel speed information to the Electronic Control Unit (ECU). The ECU signals me modulator valve for that
wheel to increase, reduce, or maintain air pressure in me brake chamber.
Before beginning any troubleshooting or testing of the Anti-Lock Brake System with Pro-Link, read all
introductory material for instructions on proper usage of the Pro-Link, and related personnel and equipment
safety issues (pages 3-100.1 through 3-100.7).