PRONAR
E. WORKING WITH THE TRACTOR
PRONAR
42
PNEUMATIC SYSTEM FOR BRAKING THE TRAILERS
Compound pneumatic system of trailers (two- and single-pipe) consists of engine-driven air-
compressor, air tank, control valves and three pneumatic joints. Joints are located in the rear of the tractor
and can be coupled with single-pipe or two-pipe braking system of the trailer. Pneumatic joints are marked
with three colours: black, red and yellow. Black joint is uded in single-pipe system, and red (feeding) and
yellow (steering) in two-pipe system.
There are many different types of braking systems of the trailer. Before setting about
connecting pneumatic braking system of the tracotr, read the manual provided by the
manufacturer.
A
C
B
Fig. E-21.
Pneumatic system joints.
A
- yellow joint (two-pipe system)
B
- red joint (two-pipe system)
C
- black joint (single-pipe system)
ATTENTION: Brakes of the trailer operates only when both brake pedals in the tractor are pressed.
For that reason one always must couple both brake pedals with pawl if you have the trailer hooked
on.
The hand brake of the tractor is connected with main control valve. After switching the hand brake
on, brakes in the trailer become actuated as well.
Single-pipe system of the trailer
If the trailer is equipped with single –pipe system, one must connect the pneumatic pipe of the trailer
to the black pneumatic joint
C (Fig.E-21)
of the tractor. After releasing brake pedals in the tractor and parking
brake lever, the pressure in the joint amounts to 0.62 MPa. Pressing brakes pedals of the tractor causes
pressure fall, that is proportional to the pressing force applied on foot brakes and brakes of the trailer
becomes activated.
Two-pipe system of the trailer
In the trailer with two-pipe braking system, one must connect the feeding pipe of hydraulic system to
the red joint
B (Fig.E-21)
, and control pipe to the yellow joint
A (Fig.E-21)
.
Two-pipe system operates only after having both pipes connected to the red and yellow
joints.
Feeding pipe (red) –
it is a pipe, which fills the tank of the pnaumatic system of the trailer. If for some
reason the braking system of the trailer gets disconnected from the tractor, the pressure falls to zero and
trailer’s brakes become activated.
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