32. OPERATION OF ABS AND ABS/ASR 32.3 PRECAUTIONS FOR USE WARNING If the ABS functions while traveling on a slippery road, the braking distance may be slightly lengthened. Even if the ABS is turned on, the tires may lock when the truck is braked when running at a very low speed. Accordingly, take care when driving on slippery roads. If the truck is braked while running at high speed or on a slippery road, more air is consumed by the ABS/ASR. If the air pressure drops and the warning buzzer sounds, stop the truck in a safe place. Wait until the air pressure is restored sufficiently, then start again.
Even with the ABS/ASR system installed, there may be instances where the truck can not travel safely such as on a road having an extremely low coefficient of friction (a frozen road, etc.) or on a steep slope. In this case, repair the road surface before driving. The truck can be driven normally even if the ABS/ASR main switch is turned off. In this case, however, watch out for lateral skidding of the truck. Even if the ABS/ASR system malfunctions, the truck can be driven normally. Watch out for lateral skidding in this case, however, while driving on slippery roads. If the warning lamp lights up, the system is automatically turned off and the ABS/ ASR system does not function.
Even if the ABS/ASR system is installed, the emergency brake function is maintained. If the ABS/ASR main switch is turned on with the brake pedal depressed or the retarder control lever pulled, exhaust sound will be momentarily emitted from the ABS valve. This does not indicate a fault. If both rear wheels slip at the same speed, the ASR will not function. In this case, adjust the engine output with the accelera- tor pedal. When installing a wireless device on the truck, select one which does not violate the wireless device-related laws/regulations and use it according to law. Mount it as far away from the devices and harness of the ABS/ASR system as possible. 5-30