Parking Brake - PRONAR T780 Translation Of The Original Instructions

regulator (3.5A)
Working brake is activated from the tractor driver's cab by pressing on the brake pedal in the
tractor. The function of the control valve (3) - figure (3.5A) is the operation of the trailer's
brakes simultaneously when tractor's brakes are applied 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. Valve used in the system is equipped with a circuit
causing the brakes to be applied 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.
Automatic brake force regulator adjusts braking force depending on trailer load and does not
require any attention of the trailers operator. When braking, compressed air from the control
valve(3) flows through the regulator (4), and then is directed to brake ram cylinders (9), (10).
The setting of brake force regulator lever mechanically connected with vehicle's axle depends
on trailer's loaded. In a fully loaded trailer compressed air freely flows through the regulator
exerting the highest braking force.

3.5 PARKING BRAKE

The parking brake is for immobilising trailer while standing motionless. The brake crank
mechanism (3) – located on the left side of chassis frame - is connected with axle rudder bar
using a steel cable (1). Rotation of the crank increases tension of the steel cable. Expander
arms exert pressure or brake pads and cause the axle to brake. Prior to moving off,
handbrake must be released - steel cable must hang loose.
3.9