Air Operated Trailer Brakes - New Holland T7030 Operator's Manual

SECTION 3 - - FIELD OPERATIONS

AIR OPERATED TRAILER BRAKES

(except Italy)
WARNING
Single line pneumatic trailer braking systems are
designed for use up to a maximum speed of 25 km/h
(15 MPH). Tractor/trailer combinations with dual line
braking systems may be used at a higher speed but
must at all times comply with local legal
requirements. Gross train weight, i.e., tractor plus
trailer(s) and/or individual trailer weight must not
exceed that laid down in local regulations governing
the use of trailers.
The following text covers operation of the air-
operated trailer braking systems that may be
installed as an alternative, or in addition to,
hydraulically-actuated trailer brakes.
The system consists of an engine-driven air
compressor, one or two air reservoirs, dependent
upon type of system installed, a pressure gauge,
control valves, two or three couplers and related
pipework.
The couplers installed at the back of the tractor may
be connected to single or dual line trailer braking
systems. Either or both types may be installed. The
air lines connected to the couplers are colour-coded
black, red and yellow. The black line is used for a
single line system, the red and yellow lines are used
for dual line systems.
IMPORTANT: The trailer brakes will only operate
when both tractor brake pedals are applied.
Therefore, always lock the brake pedals together
when a trailer is attached to the tractor.
NOTE: The tractor parking brake is connected to the
main control valve. Whenever the parking brake is
applied, the trailer brakes are activated.
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