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Custom Fire Apparatus, Inc. <br />continuously notifying the driver of activation. Pressing the switch again shall deactivate the mud/snow <br />feature. <br />The Electronic Stability Control (ESC) unit is a functional extension of the electronic braking system. It <br />is able to detect any skidding of the vehicle about its vertical axis as well as any rollover tendency. The <br />control unit comprises an angular -speed sensor that measures the vehicle's motion about the vertical axis, <br />caused, for instance, by cornering or by skidding on a slippery road surface. An acceleration sensor <br />measures the vehicle's lateral acceleration. The Controller Area Network (CAN) bus provides <br />information on the steering angle. On the basis of lateral acceleration and steering angle, an integrated <br />microcontroller calculates a theoretical angular speed for the stable vehicle condition. <br />FRONT BRAKES <br />The front brakes shall be Mentor EX225 Disc Plus disc brakes with 17.00 inch vented rotors. <br />REAR BRAKES <br />The rear brakes shall be Meritor EX225 Disc Plus disc brakes with 17.00 inch vented rotors. <br />PARK BRAKE <br />Upon application of the push-pull valve in the cab, the rear brakes will engage via mechanical spring <br />force. This is accomplished by dual chamber rear brakes, satisfying the FMVSS parking brake <br />requirements. <br />PARK BRAKE CONTROL <br />A Meritor-Wabco manual hand control push-pull style valve shall operate the parking brake system. The <br />control shall be yellow in color. <br />The parking brake actuation valve shall be mounted 6.00 inches to the left of center of the dash within <br />easy access of the driver. <br />AIR DRYER <br />The brake system shall include a Wabco System Saver 1200 air dryer with an integral heater with a <br />Metri-Pack sealed connector. The air dryer incorporates an internal turbo cutoff valve that closes the <br />path between the air compressor and air dryer purge valve during the compressor "unload" cycle. The <br />turbo cutoff valve allows purging of moisture and contaminants without the loss of turbo boost pressure. <br />The air dryer shall be mounted behind the battery box on the left hand side. <br />FRONT BRAKE CHAMBERS <br />The front brakes shall be provided with type 24 brake chambers as supplied with the Hendrickson <br />STEERTEK NXT axle. <br />REAR BRAKE CHAMBERS <br />The rear axle shall include TSE 24/30 H.O.T. (High Output Technology) brake chambers shall convert <br />the energy of compressed air into mechanical force and motion. This shall actuate the brake camshaft, <br />which in turn shall operate the foundational brake mechanism forcing the brake pads against the brake <br />rotor. <br />AIR COMPRESSOR <br />07/26/22 <br />-29- <br />