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Brakes 233
There are several ways to determine if the
parking brakes have been set. By pulling
out the yellow knob:
•
An audible rush of air will be heard
when the parking brake knob is pulled.
The air exhausts from the park brake
valve itself and from the spring brake
chambers on the rear axle(s).
•
A black ring around the base of the
yellow control knob will be seen.
•
The engine will stall if an attempt is
made to set the vehicle in motion.
•
There will be a fluctuation in the air
pressure gauge needles.
•
You will not be able to pull the knob
out any further.
Do not attempt in any way to disassem-
ble or tamper with the spring brake
chamber. The force stored in the spring,
if suddenly released, can cause serious
personal injury or death.
Do not apply the parking brake while
the vehicle is moving. The rear wheels
may lock up causing loss of vehicle con-
trol leading to an accident with severe
personal injury or death.