CAT: 8612 November 2019
Page 149
OPERATING INSTRUCTIONS
TO RELEASE THE FULL COMBINATION OF BRAKES
• Push IN BOTH knobs on the dash.
• If the air pressure is reduced below a safe level, the low-air warning
light will come on first. If air pressure continues to drop the parking
brake valve will pop OUT, automatically applying the spring brakes.
Do not try to put the vehicle in motion before pressure in the system reaches
689kPa, because the wheels are locked by the spring brake action.
Unnecessary stress and possible brake malfunction could occur if the
vehicle is forced to move before the air system reaches 689kPa.
If air pressure drops below the spring brake (Yellow) threshold
pressure, the spring brakes may stop the vehicle abruptly, which
could result in an accident and/or injuries. Observe the red warning
lamps on the gauges. If one comes on, do not continue to drive the
vehicle until it has been properly repaired or serviced.
TRUCK/TRAILER AIR SUPPLY VALVE
Initial Charge
The red octagonal knob controls the air supply to the trailer. With the
system completely discharged, both the red (trailer air supply) and the
yellow (parking brake) knobs are OUT; thus, truck and trailer parking
(spring) brakes are applied.
Allow the truck air system pressure to build up to operating level.
Normal Run Position
• The Yellow knob (system park) may now be pushed IN, which will
supply air to the truck spring brakes, releasing them.
• The Red knob may now be pushed in to charge the trailer system.
• With both knobs pushed IN, air is now being supplied to both the
trailer and the truck spring brakes; all brakes are released.
Trailer Park or Emergency Brake Application Only
If you ever have a failure or disconnect the air supply hose to the trailer,
the trailer parking brakes will set. The red knob will automatically pop OUT
and seal off the truck air reservoirs to protect the truck air system pressure.
Summary of Contents for T410
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Page 25: ...SECTION ONE OPERATING INSTRUCTIONS ...
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Page 238: ...SECTION TWO PREVENTIVE MAINTENANCE ...
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Page 331: ...SECTION THREE MAINTENANCE LUBRICATION SCHEDULES ...
Page 369: ...SECTION FOUR SERVICE RECORDS ...
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