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CAT: 8612 November 2019
OPERATING INSTRUCTIONS
To apply the trailer brakes only:
Pull OUT the red knob. This will exhaust
air from the trailer supply line, causing the truck protection valve to close
and the trailer spring brakes to apply. The trailer is now in ‘emergency’ or
‘park’ mode. This mode would be used to uncouple from the trailer and
during bobtail operation (running without a trailer connected).
Do not use the trailer hand brake or service brakes to park and hold
an unattended vehicle. Use the parking brakes. Because service
brakes work with air pressure, these brakes could slowly release.
Your vehicle could roll and cause a serious accident. Someone could
be hurt or killed. Never rely on the service brakes to hold a parked
vehicle.
TRAILER PARKING BRAKE RELEASE VALVE
The trailer park release valve is an optional fitment for use with semi/full
rear tipping trailers.
The trailer park release valve is interlocked with the main parking brake
system, per ADR 35/03 requirements. The trailer brakes can only be
released after all the parking brakes have activated and stabilised.
The engine must be running for the system to operate (engine oil pressure
switch controlled) and not moving.
The basic operation of the trailer is that the tipping motion ‘drags’ the trailer
forwards toward the truck due to the effective shortening of the drawbar as
the tip angle increases. If the trailer brakes are applied, this would then
cause the tyres of truck/trailer to be dragged backwards.
The basic sequence of operations is:
• Reverse trailer into position and then apply the parking brakes for
the complete truck/trailer combination.
• Release trailer parking brakes by activating the ‘black valve’, then
activate the tilt mechanism.
• Once tilt cycle is completed, release system parking brake to move
off, this deactivates the trailer release valve.
The trailer park release valve operates, once complete combination
parking brakes applied, by supplying air only to the trailer parking brakes
to release them. At the same time, because the combination parking
brakes have been activated, the foot pedal controlled service air brake
system is inoperative.
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