PRONAR T679/3, Operator'S Manual, Page: 46 / 117

PRONAR T679/3 PRONAR T679/4 SECTION 3
3.8
Main control valve
Relay valve
Automatic braking force regulator
Manual braking force regulator
Wire connection
Air tank
Brake cylinder
Control valve (connector)
Air filter
The task of the control valve (1) - figure (3.5),- is to activate the trailer brakes simultaneously
with the tractor brake applied. In addition, in the event of an unforeseen disconnection of the
hose between the trailer and the tractor, the control valve automatically applies the machine's
brake (applies only to pneumatic systems). The valve used has a brake release button (3),
used when the trailer is disconnected from the tractor. After connecting the air line to the
tractor, the release device automatically adjusts to the position enabling normal operation of
the brakes. The three-band braking force regulator - figure (3.5) used in pneumatic systems
adjusts the braking force depending on the setting. Switching to the appropriate operating
mode is done manually by the machine operator before starting the journey using the lever
(4). Three work positions are available:
A - "Without load”
B - „Half-load”
C - „Full load”.