AIR SYSTEM (CONT)
Without trailer operation, the air system only has
The pressure in the hydraulic dual-circuit brake
an indirect function for the brake booster (27.7)
system is assisted by the brake booster (27.7).
and for the auxiliary consumers.
The brake booster (27.7) is designed as a twin
(Refer to auxiliary consumers.)
chamber brake booster which transmits its full
volume during single operation.
For trailer operation, the outer chamber is cut out,
thereby reducing the effect of the brake booster to
The trailer will be provided with compressed air
after coupling the supply and brake lines.
Pressure is applied to the double main brake
However, supply air flows to the trailer only when
cylinder (19.3) when the service brake is operated.
the safety valve (33.2) is actuated.
At the same time, air is allowed to enter the brake
The actuating knob is depressed (push to supply
trailer) until it remains in this position on its own
From output (2) of the brake booster, the
accord (After approx. 2.8 bar pressure increase).
compressed air flows further to the shuttle valve
(28.3a), leaves output (2) and then reaches the
As a result of this pressure increase, the passage
trailer protection valve (45.) input (12). This valve
for the control pressure into the relay valve (16.1)
is ineffective when not in trailer operation.
is opened in the trailer protection valve (45.).
This is also the case when the antijackknife brake
valve (15.1) is actuated.