Code Alarm SRT 5500 Specifications download pdf (Page 11)

December 2013

REQUEST FOR PROPOSALS FOR

PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES

RFP SRTA-2014-01

TECHNICAL SPECIFICATIONS

PAGE-11

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c. Brake lights shall be activated as soon as the brake pedal is depressed and

when any auxiliary braking (transmission retarder) is applied.

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d. The parking brake shall be a spring brake MGM #E3636T, or approved equal,

with quick release yoke or manual "wind-off", capable of bringing the coach to a

stop from a speed of twenty (20) miles per hour at a deceleration rate

equivalent to a stop within sixty feet (60') with a seated passenger load. The

parking brake shall be actuated and exhausted by a manual "push-pull" valve.

The valve shall apply the brakes by pushing "in" and release the brakes by

pulling “out.” In the event of total loss of air system pressure, the spring brakes

shall be applied automatically. The control valve shall be located to the left

and adjacent to the driver for safe, convenient access.

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9.4 Brake Interlock

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The primary service brake system shall incorporates a double check valve, pressure

regulator and a solenoid valve to provide a rear brake and throttle interlock while the rear

door of the coach is open. Release occurs when the rear door is closed and the

Operator's control is deactivated. Also, the actuation must occur when kneeling and/or

wheelchair lift is used in conjunction with the front door. The front door operation shall not

be interlocked with the brake system.

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9.5 Brake Drums, Shoes and Linings

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a. Rear brake drums shall be a minimum of 14.5 by 10 inches. Front brake drums

shall be a minimum of 14.5 by 6 inches. Brake shoes shall be of two shoe type,

heavy duty, fabricated steel, heavily ribbed to insure uniform pressure. Linings

shall be non-asbestos heavy-duty transit brake block manufactured by Meritor,

or approved equal. A method of visually indicating wear of the brake lining

shall be provided. 'S'-cam brakes shall be supplied. Drums shall be labeled

with the maximum safe diameter for drum refinishing.

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b. Brakes shall be provided with "Haldex", or approved equal, automatic slack

adjusters. All slack adjusters shall be removable without disassembly or removal

of other components and equipped with grease fittings for lubrication. Slack

adjuster travel and geometry shall be designed not to exceed 90 degrees in

relation to the pushrod, when properly adjusted, throughout the lining life.

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9.6 Brake Hoses

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All brake hoses shall be installed in locations where the possibility of damage is

minimized. Hoses shall be clamped and supported by the coach structure to minimize

long unsupported hose lengths and to eliminate rubbing and/or chafing.

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9.7 Brake Retarder

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a. Transmission shall have an integral brake retarder.

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b. Retarder ON-OFF Toggle switch shall be mounted in the driver's console area,

location to be approved by the SRTA. Switch to be labeled "RETARDER" and

with ON, OFF lettering for appropriate switch position.

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10. AIR SYSTEM

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Code Alarm SRT 5500 Specifications Page 11

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