Bus stop brake

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As a stop brake at one calls buses braking function with a fixed pressure on the diaphragm cylinder of the rear axle acts. It is also possible to brake the front and rear axles. This function enables the brake to be released more quickly than is the case with the parking brake . In public buses, which are often equipped with automatic transmissions, the bus stop brake often acts as a band brake on the output shaft of the transmission.

A bus stop brake is also used in garbage trucks .

function

To apply the bus stop brake, the driver presses a switch on the dashboard. This activates the solenoid of an electro-pneumatic 2/2-way valve . A pressure reducing valve is compressed air with about 4 bar led to the diaphragm cylinders of the rear axle. To release, the switch is opened and the solenoid valve switches over. The compressed air can now escape via a quick release valve, which is noticeable by a hissing sound.

Coupling with other systems

In newer vehicles there is a coupling of door control and brakes in such a way that the brakes of the bus cannot be released as long as the doors are still open (or released). The bus stop brake is also switched on when the kneeling function of the electronically controlled air suspension is used, or when the anti-kink protection device responds in an articulated train (especially when maneuvering backwards). In newer systems, the vehicle is not brought to an abrupt stop, but only the speed is reduced.

The advantage of greater security for travelers has the disadvantage that this device temporarily paralyzes the entire vehicle in the event of a door malfunction. The bus stop brake can, however, be released using a sealed emergency release switch. The doors cannot remain open while driving, as was often the case in hot areas for better cooling of the vehicle interior.