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232 Brakes
Spring Brake For Parking
Never leave the vehicle without being
certain the parking brakes are set or that
other precautions are taken to prevent the
vehicle from rolling. Failure to do so can
result in serious personal injury or death.
The parking brake mechanism uses spring
pressure as a separate power medium to ap-
ply the service brakes on the driving axles.
The parking brake is released by the same
compressed air source used to apply the
service brakes. Since this brake is released
by air pressure, the system must be charged
to at least 60 psi (420 kPa) before the park-
ing brake may be released.
The parking brake spring tension is suffi-
cient to hold a fully loaded vehicle on
maximum grades permitted on modern
highways, provided the brake drums and
linings are in good condition and the brakes
are properly adjusted.
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 wheel
brakes are wet. To do so could damage
the brakes, if hot, or may 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 parking spring brakes.
W5000643