158 OPERATION When operating an ABS-equipped vehicle, the following guidelines should be used. • Apply the brakes as normal. If the anti-lock brake system begins to function, maintain brake pressure. Do NOT release the brakes. • Avoid rapidly pumping the brakes. The anti-lock brake system automatically applies and releases the brakes up to five times per second. • When towing a trailer, watch the trailer through the mirrors. Adjust brake application as necessary to keep the combination in a straight line. Make sure the trailer follows the tractor properly. • An amber trailer ABS lamp on the instrument panel will illuminate for several seconds at start-up during an initial function check. When a trailer ABS fault occurs, the lamp will remain illuminated until the fault is cleared. If there is a loss of communication between the tractor and trailer, the lamp will blink three times. Refer to Trailer “Anti-Lock Brake System (ABS)”, page 157 for more information. MACK Road Stability Advantage (If Equipped) The MACK Road Stability Advantage (RSA) is based on the Bendix® ABS-6 Advanced with ESP® (Electronic Stability Program) System. The RSA system aids the operator in maintaining control of the vehicle in the event of a jackknife or rollover situation by applying select brakes and reducing engine power as required by the specific situation. The RSA system, which is integral with the anti-lock brake system, uses the standard ABS components (such as wheel speed sensors and modulator valves) along with a Steering Angle Sensor (SAS-60™) and a Yaw Rate/Lateral Acceleration Sensor (YAS-60™) package to provide information concerning vehicle movement to the Advanced EC-60™ Electronic Control Unit. In most cases, vehicle repairs will not affect function of the MACK RSA system. However, the following repairs require recalibration of the SAS-60™ sensor after the repair has been made:
• Removal and reinstallation or replacement of the SAS-60™ sensor CAUTION Installation of an aftermarket steering wheel may damage the SAS-60™ sensor. It is therefore recommended that the OEM steering wheel NOT be replaced with an aftermarket wheel.
