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CHAPTER 3
Pronar PT512
trailer's brake. The same effect of emergency braking is achieved when the engine is turned
off and during the loss of voltage on the solenoid.
FIGURE 3.9
Electro-hydraulic brake valve
(1) electro-hydraulic valve, (2) valve working mode selection lever, (3) release button,
(4) electric coil, (A) position "NO LOAD", (B) position "HALF LOADED", (C) position "FULL
LOAD".
The valve used is equipped with a circuit causing the brake to release. It can be used when
the trailer is disconnected from a tractor. The brake is released when the pressure in the
trailer's system is reduced – see figure (3.9). The brakes operate normally after the connector
3.13
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