PRONAR T386, Operator'S Manual, Page: 53 / 162

SECTION 3 Pronar T386
3.11
For systems with automatic regulator, braking force depends on trailer load. The automatic
regulator does not require maintenance during normal use of the trailer.
3.2.4 PARKING BRAKE
The parking brake is used for immobilising trailer while standing motionless. The hook trailer
can be equipped with two types of parking brake – figure (3.8):
•
pneumatic (A) – standard equipment,
•
mechanical (B) – optional equipment.
Pneumatic parking brake is activated by loosening-parking valve (1). Two push-buttons
located in this valve make it possible to set the trailer to an appropriate working mode. Black
push-button (2) controls the loosening valve, that is designed for releasing or engaging the
brake if the trailer is unhitched from the tractor. There is no possibility of pressing this push-
button if pneumatic connections are connected to tractor.
Red push-button controls operation of parking valve. In the trailer that is correctly hitched to
the tractor by means of connections (red and yellow), the black push-button of the loosening
valve should be pulled out. Braking of the trailer wheels is carried out by pulling out the red
push-button (3). Location of individual push-buttons is shown on the plate (4).
FIGURE 3.8 Parking brake
(1) loosening-parking valve, (2) black push-button, (3) red push-button, (4) information plate,
(5) brake crank mechanism
Brake crank mechanism (5) is welded to the front beam of the lower frame and is connected
with expander shaft levers by means of steel cables and a tensioning lever. Tightening the