NOTE: Before a vehicle with insufficient system air
pressure can be moved, the spring parking brakes
must be released by applying an external air
source at the gladhands, or by manually caging
(manually releasing) the parking brake springs.
After correcting the brake system problem, uncage the
spring parking brakes before resuming normal vehicle
operation.
Operation
Before driving the vehicle, secure all loose items in the
cab so that they will not fly forward during a full brake
application. Make sure all occupants are wearing seat
belts.
During normal brake stops, depress the foot brake con-
trol pedal until braking action slows down the vehicle.
Increase or decrease the pressure on the pedal so that
the vehicle comes to a smooth, safe stop. When the
forward speed of the vehicle has decreased almost to
the idling speed of the engine, push the clutch pedal in,
and shift the transmission into neutral. Apply the spring
parking brakes if the vehicle is to be parked.
The yellow diamond-shaped knob (Fig. 7.1) on the con-
trol panel actuates the parking brake valve. Pulling out
the knob applies the spring parking brakes.
CAUTION
Do not use the spring parking brakes if the service
brakes are hot, such as after descending a steep
grade. Also, do not use the spring parking brakes
during freezing temperatures if the service brakes
are wet. To do so could damage the brakes if hot, or
cause them to freeze during cold weather.
If the brakes are wet, drive the vehicle in low gear
and lightly apply the brakes to heat and dry them.
Allow hot brakes to cool before using the spring
parking brakes. Always chock the tires.
If the brakes are wet, drive the vehicle in low gear and
lightly apply the brakes to heat and dry them.
Allow hot brakes to cool before using the spring parking
brakes. Always chock the tires.
f421624
Fig. 7.1, Parking Brake Valve Knob
Brakes
7.2
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