Preventive Maintenance Brake System
Medium Duty
(R10/06) Y53-6008 – 157 –
Visually inspect brake shoe lining for wear, cracks, or break-
age. 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.
Anti–Lock Braking System (ABS)
Your Medium Duty is equipped with an anti-lock braking sys-
tem. For detailed service information, see the Peterbilt
Medium Duty Maintenance Manual. All service work
should be performed by a qualified technician at an Autho-
rized 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.
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.
PARKING BRAKE COMPONENTS
BRAKE
SHOE
LININGS