Bus Door Service Brake Interlock System

The interlock system includes a foot valve assembly to effect a service brake application when warning lights are activated a vehicle door is open and minimum speed conditions are met.

Bus door service brake interlock system. This specification sets the criteria for the design of a bus door safety system which is intended to prevent passengers from being trapped in the doors of a moving bus 1 2. Deceleration aspects of brake testing. There are engineering systems in place which are designed to prevent incidents of runaway buses. These are however not substitutes for drivers vigilance in ensuring that the park brake is always applied before leaving the drivers seat.

Interlock and emergency brake systems are not covered in this document. An auxiliary line is positioned between a source of pressure and the foot valve. A door brake interlock system or the bus stop brake to secure the bus. A brake interlock system could easily allow a driver being held at gunpoint the means to prevent the bus from moving by purposely not following the required release steps and claiming mechanical problems to the assailant thus giving law enforcement more time to respond.

Bus door safety systems 1. The interlock system includes a foot valve assembly to effect a service brake application when warning lights are activated a vehicle door is open and minimum speed conditions are met. Door interlock kit spring brake control valve to accessories ttypical school bus air system schematicypical school bus air system schematic wwith a bendixith a bendix ad isad is air dryerair dryer test 3 pressure modulator valve and traction control valve chuff full pressure engine stopped parking brakes released ok not ok. A door safety system meeting the criteria in this specification will prevent the bus from moving or stop it if already moving.

A bus door service brake interlock system having a warning system is provided. Door brake interlock mgm service and parking brake releasing spring brake manually. The virginia department of education has notified the commonwealth s 132 school divisions that as many as 4 000 school buses may need retrofitting this summe. If air pressure fails in the piston chamber the power spring applies the brakes and unless pressure can be reestablished the service brakes must be released as follows in order to move the coach.

An auxiliary line is positioned between a source of pressure and the foot valve assembly and includes a valve and a low pressure. The system is based on a sequential operation of the driver activating the caution lights and opening the door.