Additional vacuum supply for brake booster, function

B42.60-0168-06

13.02 Brake pedal valve

14.08 Manual parking brake valve

16.01 Relay valve

28.01 Bidirectional valve

28.02 Quick discharge valve

38.02 Test switch

a Supply pressure

b Control pressure

c Brake pressure

operation:

The compressed air that activates the valves of the (BV) set derives from the DE and DS sets.

Brake pedal valve (13.02).

It uses the stored air on the compressed air tanks (5.01), braking the vehicle when the driver activates the brake pedal. This guarantees that the vehicle has a gradual and proportional braking to the effort applied onto the brake pedal.

After being activated, a control pressure exits to the relay valve (16.01) from the pedal brake valve (13.02) output (21), which sends air to a bidirectional valve (28.01).

On the output (22) of the brake pedal valve (13.02), the air is sent to the electropneumatic valve of the ABS (45.01) front axle cylinder (20.02).

Manual parking brake valve (14.08).

When it is activated, it allows the progressive application or non-application of the parking brake.

On the output (21), a pressure command exits to the relay valve (16.01), which passes through the fast discharge valve (28.02) and reaches the bidirectional valves (28.01).

The air that flows from the manual parking valve (14.08, connector 23) passes through the fast discharge valve (28.02) and reaches the bidirectional valves (28.01).

The fast discharge valves (28.02) act on the draining of the compressed air that returns from the circuit, abbreviating the time that it would take for the discharge to be done on the manual parking brake valve (14.08).

The bidirectional valves (28.01) are commanded by two sides. Receiving air from two different circuits, they direct the bigger pressure to the rear axle cylinders.