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Custom Fire Apparatus, Inc. <br />The rear dual wheels shall include a plastic isolator approximately 0.04" installed between the inner and <br />outer wheel hub to help prevent corrosion caused by metal to metal contact. There shall also be a plastic <br />isolator between the axle hub and the wheels on both front and rear axles. <br />TIRE CHAINS <br />Onspot brand extreme duty six (6) strand automatic ice chains shall be installed on the rear axle of the <br />chassis to provide instant traction while traveling on ice and snow at speeds below 35 MPH. <br />TIRE CHAINS ACTIVATION <br />The tire chain system shall be activated by a virtual button on the Vista display and control screen. The <br />virtual button shall display "Active" when the tire chains are engaged. The tire chains shall be <br />interlocked with the transmission and shall engage only if the vehicle is traveling 30 MPH or less. After <br />traveling over 30 MPH, the vehicle must be reduced to a speed below 5 MPH for the tire chains to be <br />engaged or re-engaged. The virtual button, once the vehicle reaches 35 MPH shall be reset to "Inactive". <br />The vehicle must then reduce to a speed below 5 MPH to enable the tire chains virtual button. <br />BRAKE SYSTEM <br />A rapid build-up air brake system shall be provided. The air brake system shall include, at a minimum, a <br />three (3) air tank, four (4) reservoir system with a total of 6236 cubic inch of air capacity. A floor <br />mounted treadle valve shall be mounted inside the cab for graduated control of applying and releasing the <br />brakes. An inversion valve shall be installed to provide a service brake application in the unlikely event <br />of primary air supply loss. All air reservoirs provided on the chassis shall be labeled for identification. <br />The tandem rear axle spring brakes shall automatically apply in any situation when the air pressure falls <br />below 25 PSI and shall include a mechanical means for releasing the spring brakes when necessary. An <br />audible alarm shall designate when the system air pressure is below 60 PSI. <br />A six (6) sensor, six (6) modulator Anti -lock Braking System (ABS) shall be installed on the front and <br />tandem rear axles in order to prevent the brakes from locking or skidding while braking during hard stops <br />or on icy or wet surfaces. This in turn shall allow the driver to maintain steering control under heavy <br />braking and in most instances, shorten the braking distance. The electronic monitoring system shall <br />incorporate diagonal circuitry which shall monitor wheel speed during braking through a sensor and tone <br />ring on each wheel. A dash mounted ABS lamp shall be provided to notify the driver of a system <br />malfunction. The ABS system shall automatically disengage the auxiliary braking system device when <br />required. The speedometer screen shall be capable of reporting all active defaults using PID/SID and <br />FMI standards. <br />Additional safety shall be accommodated through Automatic Traction Control (ATC) which shall be <br />installed on the tandem rear axle. The ATC system shall apply the ABS when the drive wheels loose <br />traction. The system shall scale the electronic engine throttle back to prevent wheel spin while <br />accelerating on ice or wet surfaces. <br />A momentary rocker style switch shall be provided and properly labeled "mud/snow". When the switch <br />is pressed once, the system shall allow a momentary wheel slip to obtain traction under extreme mud and <br />snow conditions. During this condition the ATC light and the light on the rocker switch shall blink <br />07/26/22 <br />-28- <br />