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Date of Origin – 02/24/11
Updated – 02/03/20
BRAKE CONTROLS
Proper operation of the brake system requires a good, clean seal between the glad hands. Inspect the rubber wash-
ers for each glad hand daily. Inspect the glad hands for cracks in the metal components daily. Check the air hoses for
cracking and leaking daily. Check the operation of the braking system daily. Drain any water from the brake system by
opening the drain petcocks on the bottom of the air tank(s) daily. Observe the ABS system status indicator lamp for
proper operation as found under the ABS heading in the Safety Section.
AIR SYSTEM COLD WEATHER OPERATION
Reservoir Draining – Daily reservoir draining is the most basic step in reducing the possibility of freeze up.
Thawing Frozen Air Lines
1. Maintain freeze prevention devices to prevent frozen air lines. Daily check evaporators or injectors. Check the
air dryer for proper operation and change the desiccant when needed.
2. Thaw out frozen air lines and valves by placing vehicle in a warmed building. This is the only method for
thawing that will not cause damage to the air system or its components.
3. Do not apply an open ame to air lines and valves. Beyond causing damage to the internal non-metallic parts
of valves and melting or burning non-metallic air lines, THIS PRACTICE IS UNSAFE AND CAN RESULT IN
VEHICLE FIRE.
CAUTION! Do not pour any alcohol into gladhands. Doing this will result in valve failure and
will void the warranty. Fluid in air lines can also cause a uid lock and keep the brakes from fully
releasing.
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