Hino 600, Workshop Manual, Page: 405 / 451

ABS (ABS : FULL AIR) BR03–2
ABS
OVERVIEW
EN0680203C100001
ABS is a system that makes effective use of the friction between the tires
and the road surface to maintain vehicle stability while the brakes are being
applied and for stopping the vehicle.
Applying the brakes forcefully on a slippery road surface can cause the
wheels to be locked, due to excessive braking force. This causes the vehi-
cle to lose stability because the locked wheels lose resistance in the lateral
direction. More specifically, if the front wheels are locked, it becomes
impossible to steer the vehicle, and if the rear wheels are locked, the rear of
the vehicle may fishtail from side to side.
Also, when wheel-locking occurs, it is not possible to make effective use of
friction between the tires and the road surface. This may cause the braking
distance to be increased.
ABS uses wheel sensors mounted on the axles to constantly monitor the
rotation of the wheels. If any of the wheels is starting to lock up, the ABS
ECU sends signals to the ABS control valve and immediately adjusts the
brake pressure to prevent wheel-locking.
In this way, ABS maintains the stability of the vehicle while stopping by
making effective use of the friction between the tires and the road surface.
SHTS068020300001
1 Wheel sensors 3 Relay valve
2 ABS control valves 4 ABS ECU