Single Operation

TM 5-2420-224-20-1

AIR SYSTEM (CONT)

Single Operation

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.

Trailer 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

approx. 70%.

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

booster (27.7).

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.

1-16.6

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