Using the Brake System Operating Instructions
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PB1318 3/01 Model 330
vehicle. Be sure to be in the right gear before you
start down a hill, especially if you have a manual
transmission. You could get hung up in NEUTRAL
and lose the benefit of engine braking. “Coasting” is
illegal, and also VERY dangerous.
Anti-Lock Braking System
This vehicle is equipped with an Anti-Lock Braking System
(ABS). ABS reduces the likelihood of a wheel locking. If a
wheel is about to lock during braking, the ABS will automati-
cally adjust hydraulic pressure to the brake calipers on the
appropriate wheel(s) to prevent wheel lock-up. The ABS is
automatically activated when the ignition switch is turned on.
Hydraulic fluid from the primary and secondary master cylin-
der chambers feeds the (ABS) modulator valve body. Simul-
taneously, the vehicle's ABS system detects wheel speeds.
The sensors generate signals that are transmitted to an Elec-
tronic Control Unit (ECU). If the wheels start to lock, the ECU
signals the modulator assembly to regulate the brake pres-
sure of each locking wheel.
WARNING! Do not replace wheels or tires with a
different size than originally installed. The Anti-
Lock Brake System (ABS) is calibrated for the
specific tire revolutions per mile. Use of a differ-
ent tire and/or wheel size may cause the ABS
system to not function during a hard braking
event. This could cause an accident or serious
personal injury. See “Wheel and Tire Replace-
ment for Trucks with Hydraulic Brakes” on page
182 to determine the acceptable range of tire rev/
mile.
ABS Warning Lamp
The ABS warning lamp will come on briefly, then go off, when
the key switch is first turned on. If the lamp remains ON until
a speed of 4 mph (6 km/h) is reached, then goes OFF, there
may be a stored fault code. If the lamp remains ON when a
speed in excess of 4 mph (6 km/h) is reached, there may be
an active fault in the ABS system.
CAUTION: If the ABS warning light does not illu-
minate when the ignition is first turned on, there
is a problem with the bulb or wiring. You should
have this checked as soon as possible.
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