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Pronar PT512
CHAPTER 3
FIGURE 3.8
A single-line hydraulic braking system
(1) electro-hydraulic valve, (2) hydraulic cylinder, (3) hydraulic quick coupling, (4) hydraulic
accumulator, (5) socket, (6) valve connector cable, (7) information decal
The main hydraulic brake (available optionally) is activated from the tractor driver's cab by
pressing the brake pedal. A tractor with an appropriate hydraulic system is required to
operate the trailer's hydraulic braking system. The function of an electro-hydraulic valve (1) –
figure (3.9) – is to operate the trailer brakes simultaneously with the tractor brakes. Before
driving off, check the brakes operation. To do so, press the brake pedal several times to rise
a pressure in the hydraulic accumulators. The connector cable (6) is used to connect the
trailer's brake valve with a tractor's electrical system. In case of an incidental disconnection of
the cable (6) between the trailer and a tractor, the brake valve will automatically activate the
3.12
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