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3.3 Single-line hydraulic trailer brake
(1) Hydraulic control hose
Connect the hydraulic hose of the towed vehicle to the
outlet of the tractor. If the hydraulic brake hose is not
connected, the brake system may malfunction and
accidents may occur. Carefully check the brake
mechanism of the towed vehicle and connect the hoses
correctly.
• The hydraulic control hose has the role of
transmitting the signal from the foot brake pedal to
activate the trailer brakes.
NOTE :
• Stop the engine and apply the parking brake
before attaching and detaching the hydraulic
hose.
• Be aware that even with the parking brake
“applied”, brakes will not be applied to the
trailer wheels.
IMPORTANT :
• Make sure to only connect and use a trailer with
hydraulic single-lines trailer brakes.
3.4 Dual-line pneumatic trailer brake
(1) Connector (A), yellow (dual-line brake)
(2) Connector (B), red (dual-line brake)
Dual-line trailer brake:
Connect the air hoses securely to the connectors (A)
and (B) of the tractor.
Air is constantly supplied to the trailer side air tank via
the red connector hose.
Pneumatic pressure proportional to the force on the
brake pedal is transmitted via the yellow connector
hose to the trailer side brake equipment, and activates
the brakes according to the pressure.
When the parking brake is applied, the internal
pressure in the red connector hose drops, activating
the trailer brakes.
IMPORTANT :
• Make sure the air hose connections are clean.
After using the air hoses, be sure to put their
protective caps back in position.
• With the air hoses connected, step on the brake
pedal several times with the engine off to make
sure there is no air leak at the connections.
3.4.1 Inspecting the pneumatic pressure
The pneumatic trailer brake pressure can be checked
with the
“pneumatic pressure gauge”
on the instrument
panel. If the pressure drops below specified, the
“trailer
brake warning indicator”
on the instrument panel lights
up.
(1) Pneumatic pressure gauge
(2) Trailer brake warning indicator
OPERATING THE TRACTOR
BRAKE CONTROLS
154
M7132, M7152, M7172
Summary of Contents for M7-132
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