Note:
Read and understand the following
steps and perform them whenever you
prepare to drive the vehicle.
Note:
The parking brake does not disengage
unless sufficient system air pressure is
available.
1.
Press and hold the service brake pedal
while the engine is running.
2. Select the appropriate drive gear.
3. Push and hold the yellow
dash-mounted parking brake knob until
the parking brake light turns off, then
release.
Parking Brake Light Illumination due
to Low Air Pressure
If the air pressure becomes too low at any
time during vehicle operation, the parking
brake may apply and the parking brake
light turns on.
If the parking brake applies due to low air
pressure, immediate service is required to
the parking brake system.
Parking Brake Warning System
If the parking brake light blinks and a tone
sounds when pulling the yellow control
knob out, this indicates the parking brake
is not functioning properly. Seek service for
the parking brake immediately.
With the ignition key not in the run position:
•
A tone sounds if the parking brake
remains released (or in an unknown
state). The tone stops after
approximately 8 minutes or until the
parking brake is applied. Seek service
for the parking brake immediately.
Diesel engines:
Parking brake light
operation (the light only works when the
ignition key is in the run position):
•
On:
Parking brake applied.
•
Off:
Parking brake released and no
faults or malfunctions detected.
•
Blink and tone:
Parking brake
released (or in an unknown state) and
faults or malfunctions detected.
Releasing Spring Manually
WARNINGS
Do not attempt to disassemble the
parking brake chamber under any
circumstances. The high spring load
may cause serious injury.
Block the wheels to help prevent the
vehicle from moving.
Unexpected and possibly sudden
vehicle movement may occur if these
precautions are not taken.
If you release hydraulic pressure from the
spring brake chamber the power spring
applies the brake and, unless hydraulic
pressure can be re-established, you must
release the spring brake as follows in order
to move your vehicle.
E210364
122
F650750 (TBC), enUSA, First Printing
Brakes