Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Operating Instructions
Using the Brake System
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 automatically
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.
CAUTION: The center pin of the 7-way trailer light
line may be constantly powered for ABS. Make
sure it will not accidently turn on trailer equipment.
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 illuminate
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.
0
OIL
!
BRAKE
MIRROR
HEAT
LOW
WATER
WATER
ABS WARNING INDICATOR
WARNING! No indication will be given via the
dashboard warning lights or buzzer if tires of the
wrong size are installed on your vehicle. The
Anti-Lock Brake System (ABS) is calibrated for
the specific tire revolutions per mile. Use of a tire
and/or wheel size different from that originally
installed on your vehicle may cause the ABS system
to not function during a hard braking event.
This could cause an accident or serious personal
injury. Consult with your Peterbilt dealer
before using a different tire and/or wheel size
than was originally installed on your vehicle.
Medium Duty (R10/06) Y53-6008 – 93 –