Specifications

STARTING AND OPERATING THE VEHICLE USING THE BRAKE SYSTEM
Medium Duty
(R05/09) Y53-6008A – 123 –
Parking Brake Burnishing
This procedure is recommended for new vehicles where
less lever actuation force is required. This procedure is
mandatory whenever the driveline brake shoes or brake
drum are replaced.
WARNING! If a new drum or new brake shoes
are installed, the driveline brake must be bur-
nished. Failure to properly burnish the park-
ing brake before putting it in service could
result in an inoperative parking brake, possi-
ble vehicle rollaway, and serious personal
injury or damage to the vehicle.
1. Drive the vehicle at 15 mph (24 km/h) in a low gear
(first or second) on a dry, hard road surface.
2. Apply the parking brake lever with a moderate force
(approximately 40 pounds) until the vehicle is
brought to a stop. Do not allow the wheels to lock up.
3. After stopping, release the parking brake lever and
drive the vehicle at 20 mph (32 km/h) in a low gear
for approximately 2.5 miles, to allow the brake drum
to cool.
4. Repeat steps 1, 2, and 3 above until a total of 10
stops have been completed.
5. Adjust the parking brake lever. See the Medium Duty
Maintenance Manual.