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Design and operation
3.4 MAIN BRAKE
Depending on the version, the trailer is
equipped with one of the three main brake
types:
• 2-line pneumatic system - figure (3.4).
• 2-line pneumatic system with ALB -
figure (3.5)
• hydraulic brake system - figure (3.6).
The main brake is activated from the
tractor driver's cab by pressing on the
brake pedal. The purpose of the control
valve (1) - figure (3.3) used in pneumatic
systems is to actuate the trailer brakes si-
multaneously with the tractor brakes. Fur-
thermore, if a line between the trailer and
the tractor gets disconnected inadvert-
ently, the control valve will automatically
activate the trailer brakes.
To released the trailer brakes (automatically
2
1
1
1
2
Figure 3.4 Diagram of 2-line pneumatic braking system
2-1
2
4
4
1
2
4
3
B
A
C
Figure 3.3 Control valve and braking force
regulator
(1) control valve
regulator
button (4) adjustment lever
(A) "NO LOAD" position
(B) "HALF LOAD" position
(C) "FULL LOAD" position
2
4
1
2
PRONAR T700M/1
Section 3
1
2
259-G.19-1
(2) braking force
(3) brake release
623-G.03-1
3.7
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