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

Operating Instructions
To prevent drums from distortion while they cool down:
• Park the vehicle on level surface and block the wheels.
• Release the parking brake and allow the brakes to cool
down. See page 74.
Using the Brake System
ABS lamp will remain on until a speed of no more than 9 mph
has been reached and the speed sensors have been
checked for correct output. The lamp should remain off after
this point unless a failure in the system is detected. The
truck/tractor ABS lamp is located in the warning lamp cluster.
Anti-Lock Braking System
This vehicle may be equipped with an anti-lock braking system
(ABS). This ABS reduces the possibility of wheel lockup.
If a wheel is about to lock during braking, the ABS will
automatically adjust air pressure to the brake chambers on
the appropriate wheel(s) to prevent wheel lock-up. The ABS
is automatically turned on when the ignition switch is turned
on.
ABS Warning Lamps
Truck/Tractor ABS Warning Lamp
A truck/tractor ABS warning lamp illuminates when the ignition
switch is first turned on and will remain on until the system
self-test has been completed successfully. Normally, the
CAUTION: If the truck/tractor 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.
Medium Duty (R10/06) Y53-6008 – 81 –