3.11
FIGURE 3.8A
Hydraulic brake system
(1) hydraulic brake cylinder, (2) hydraulic connection, (3) information sticker
Depending on the type of pneumatic installation, trailer can be equipped with one of the two
types of control valves. Its task is to activate the trailer's breaks when the brake pedal is
pressed in the tractor. Furthermore, in case of an inadvertent disconnection of the conduit
between the trailer and the tractor, the control valve will automatically activate trailer's brakes.
Valves used in the system are equipped with a circuit causing the brakes to be applied which
is used when trailer is disconnected from the tractor. When compressed air conduit is
connected to a tractor, the device automatically applying the brakes now changes its position
to allow normal brake operation.
Three-step brake force regulator used in single and double conduit brake system matches
the braking force to current loading of the trailer. Switching to a suitable working mode is
done manually by the driver prior to moving off using the lever (1) – figure (3.9A). The
regulator has 3 working positions: "no load", "half load", "full load".
Summary of Contents for T644/1
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