BENDIX M-12-M-12R ANTILOCK MODULATOR Especificaciones descargar pdf (Pagina 37)

Windsor-Severence Fire Protection District

Heavy Rescue

Production Specification

SVI #774 Page 37 of 126 April 19, 2010

BRAKE SYSTEM

A rapid build-up air brake system shall be provided. The air brakes shall include a two (2) air tank, three (3) reservoir

system with a total of 4152 cubic inch of air capacity. A floor mounted treadle valve shall be mounted inside the cab for

graduated control of applying and releasing the brakes. An inversion valve shall be installed to provide a service brake

application in the unlikely event of primary air supply loss.

The rear axle spring brakes shall automatically apply in any situation when the air pressure falls below 25 PSI and shall

include a mechanical means for releasing the spring brakes when necessary. An audible alarm shall designate when

the system air pressure is below 60 PSI.

A four (4) sensor, four (4) modulator anti-lock braking system (ABS) shall be installed on the front and rear axles in order

to prevent the brakes from locking or skidding while braking during hard stops or on icy or wet surfaces. This in turn shall

allow the driver to maintain steering control under heavy braking and in most instances, shorten the braking distance. The

electronic monitoring system shall incorporate diagonal circuitry which shall monitor wheel speed during braking through a

sensor and tone ring on each wheel. A dash mounted ABS lamp shall be provided to notify the driver of a system

malfunction. The ABS system shall automatically disengage the auxiliary braking system device when required. The

speedometer screen shall be capable of reporting all active defaults using PID/SID and FMI standards.

Automatic traction control which shall be installed on the single rear axle. The automatic traction control system shall

apply the anti-lock braking system when the drive wheels loose traction. The system shall scale the electronic engine

throttle back to prevent wheel spin while accelerating on ice or wet surfaces.

Additional handling capabilities shall include roll stability control which shall monitor the vehicles rollover threshold based

on the lateral acceleration. The system shall activate a computerized device which shall slow the vehicle when the

threshold is exceeded in either direction. Normal vehicle operation shall resume once the problematic conditions cease.

Roll stability control shall be integral with the ABS and ATC systems.

A virtual style switch shall be provided and properly labeled “mud/snow”. When the switch is pressed once, the system

shall allow a momentary wheel slip to obtain traction under extreme mud and snow conditions. During this condition the

ATC light shall blink continuously notifying the driver of activation. Pressing the switch again shall deactivate the

mud/snow feature.

The electronic stability control unit (ESC) is a functional extension of the electronic braking system. It is able to detect any

skidding of the vehicle about its vertical axis as well as any rollover tendency. The control unit comprises an angular-

speed sensor that measures the vehicle’s motion about the vertical axis, caused, for instance, by cornering or by skidding

on a slippery road surface. An acceleration sensor measures the vehicle’s lateral acceleration. The CAN bus provides

information on the steering angle. On the basis of lateral acceleration and steering angle, an integrated microcontroller

calculates a theoretical angular speed for the stable vehicle condition.

FRONT BRAKES

The front brakes shall be Meritor EX225 Disc Plus disc brakes with 17" vented rotors.

REAR BRAKES

The rear brakes shall be Meritor EX225 Disc Plus disc brakes with 17.00 inch vented rotors.

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BENDIX M-12-M-12R ANTILOCK MODULATOR Especificaciones Pagina 37