Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Brake System
Visually inspect brake shoe lining for wear, cracks, or breakage.
If linings are worn down to 2.5 mm (0.10 in), they must
be replaced. Inspect brake drum for deep scores, heat spots,
cracks, or damage. Replace if needed.
BRAKE
SHOE
LININGS
Anti–Lock Braking System (ABS)
Preventive Maintenance
Your Medium Duty vehicle is equipped with an anti-lock braking
system. For detailed service information, see the Peterbilt
Medium Duty Maintenance Manual. All service work
should be performed by a qualified technician at an Authorized
Service Center. The foundation brake system must be
in proper working order to ensure the best ABS performance.
CAUTION: Do not weld anywhere on the vehicle
before detaching the ABS Electronic Control Unit
(ECU) connector and all other electronic control
units. Welding equipment can send an energy
surge through electronic equipment and cause
damage. Disconnect all ECUs before attaching
welding equipment.
PARKING BRAKE COMPONENTS
CAUTION: Never detach the ECU connector with
the ignition turned on. The connectors could arc
and damage electronic equipment. Turn off the
ignition before disconnecting any electronic
equipment.
Other precautions
• Check ABS wiring harnesses periodically for chafing or
other problems. No regular maintenance is required on
the ABS components.
– 192 – Y53-6027 Medium Duty (R05/09)