Additional vacuum supply for brake booster, function

B42.60-0059-12

Vehicles 693.023/.028/.081/.108/.128/.386/.396

694.004/.024/.041/.047

695.014/.016/.043

13.02 Brake pedal valve

14.12 Manual parking brake valve

16.01 Relay valve

38.02 Test switch

a Supply pressure

b Control pressure

c Brake pressure

d Electrical drive

B42.60-0286-12

Vehicle 693.028

13.02 Brake pedal valve

14.12 Manual parking brake valve

16.01 Relay valve

38.02 Test switch

a Supply pressure

b Control pressure

c Brake pressure

d Electrical drive

operation:

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

The brake pedal valve 13.02 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, the brake pedal valve (13.02) sends the air to the pneumatic cylinders (22.01) and (20.02) of the axles.

Additionally to output 21 of the brake pedal valve (13.02), there is a test switch (38.02) that allows for inspections of whether the system pressure is correct or not.

The manual parking brake valve (14.12), when activated, allows the progressive application and non-application of the parking brake because it sends a pressure command to the relay valve (16.01), which quickly acts on the accumulator spring chambers' supply and draining, abbreviating the actuation time of the axle cylinder.

Additionally to output 2 of the relay valve (16.01), there is a test switch (38.02) that allows for inspections of whether the system pressure is correct or not.

The parking brake valve (14.12) has a mechanical switch integrated that sends an electric signal directly to the lamp (9.01 - I), informing the driver that the parking brake is applied. This switch is activated every time that the parking brake valve (14.12) is applied.