OPERATING THE BRAKE SYSTEM
WARNING!
No indication will be given via the
dashboard warning lights or buzzer
if tires of the wrong size are installed
on your vehicle.
The Anti-Lock
Brake System (ABS) is calibrated
for the specific tire revolutions per
mile. Use of a tire and/or wheel size
different from that originally installed
on your vehicle may cause the ABS
system to not function during a hard
braking event. This could cause an
accident or serious personal injury.
Consult with your Peterbilt dealer
before using a different tire and/or
wheel size than was originally in-
stalled on your vehicle.
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 burnished. Failure to prop-
erly burnish the parking brake before
putting it in service could result in
an inoperative parking brake, pos-
sible 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.
4-40
Y53-6060-1C1
(03/17)
4
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