Using the Brake System Operating Instructions
– 94 – Y53-6008
Medium Duty (R10/06)
Parking Brake Burnishing
This procedure is recommended for new vehicles where less
lever actuation force is required. This procedure is manda-
tory 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 parking
brake before putting it in service could result in
an inoperative parking brake, possible vehicle
rollaway, and serious personal injury or dam-
age 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.
