Antilock Braking System
The Antilock Braking System (ABS) passively monitors vehicle wheel speed at all times, and controls wheel speed during emergency stops or wheel lock situations.
During emergency or reduced-traction stops, fully depress the brake pedal until the vehicle comes to a safe stop. Do not pump the brake pedal. With the brake pedal fully depressed, the ABS controls all wheels to provide steering control and a reduced braking distance.
The ABS is designed to communicate with a trailer ABS, if they are compatible. Compatibility results in the illumination of the trailer ABS lamp during vehicle start-up and fault detection. The trailer ABS lamp will not illuminate unless a compatible trailer is connected to the tractor.
Vehicles with ABS may have Automatic Traction Control (ATC). On these vehicles, the ATC system automatically limits wheel spin during reduced-traction situations. In normal braking applications, the standard air brake system is in effect.
Pressing the ATC SPIN switch, shown in Fig. , shuts ATC off and allows drive wheel spin. Pressing the switch again, or cycling the keyswitch, switches the system back to normal operation.
Notice: The ATC spin feature is intended to be used under specific slippery conditions that require momentary increased wheel spin. Using this option for an extended period of time may damage the vehicle brake system.
