Main Brake - PRONAR T683 Operator's Manual

Pronar T683

3.2.3 MAIN BRAKE

The trailer is equipped with one of the five types of main brake:
• single conduit pneumatic system with manual three position regulator, figure (3.4),
• double conduit pneumatic system with manual three position regulator, figure
(3.5),
• double conduit pneumatic system with automatic regulator, figure (3.6),
• hydraulic braking system, figure (3.7),
• combined braking system (pneumatic-hydraulic braking system) – figure (3.8).
The main brake (pneumatic or hydraulic brake) is activated from the tractor driver's cab by
pressing on the brake pedal. The function of the control valve (2) - figure (3.4), (3.5) and (3.6)
is to activate the trailer's brakes simultaneously with the tractor's brakes. Furthermore, in
case of an inadvertent disconnection of the line between the trailer and the tractor, the control
valve will automatically activate trailer's brakes. The valve used in the system is equipped
with a circuit causing the brakes to be applied when the trailer is disconnected from the
tractor, compare figure (3.7). When compressed air line is connected to the tractor, the
device automatically applying the brakes now changes its position to allow normal brake
operation.
Figure (3.8) shows the design of the combined braking system (i.e. pneumatic-hydraulic
braking system). The system combines the pneumatic braking system with manual braking
force regulator and the hydraulic braking system with electro-hydraulic brake valve.
3.8
SECTION 3