Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 38 of 126 April 19, 2010
PARK BRAKE
Upon application of the push-pull valve in the cab, the rear brakes will engage via mechanical spring force. This is
accomplished by dual chamber rear brakes, satisfying the FMVSS parking brake requirements.
In addition to the mechanical rear brake engagement, the front service brakes will also engage via air pressure, providing
additional braking capability.
PARK BRAKE CONTROL
A Meritor-Wabco manual hand control push-pull style valve shall operate the parking brake system. The control shall
be yellow in color.
The parking brake actuation valve shall be mounted on the left hand dash to the right of the steering column within easy
reach of the driver.
AIR DRYER
The brake system shall include a Bendix AD-9 fully self contained air dryer which shall not require an extra purge tank or
additional valves. The AD-9 system shall include a spin-off desiccant filter with a 12-volt, 75-watt thermostatically
controlled heating element. The air dryer shall feature 3.9 pounds of premium, high crush strength desiccant which shall
be produced with a composition that shall be more effective and longer lasting than other desiccants. It shall also offer
protection against contamination and desiccant breakdown. The air dryer shall be mounted behind the battery box on the
left hand side.
FRONT BRAKE CHAMBERS
The front brakes shall be provided with MGM type 24 long stroke brake chambers.
REAR BRAKE CHAMBERS
The rear axle shall include TSE 24/30 H.O.T. (High Output Technology) brake chambers shall convert the energy of
compressed air into mechanical force and motion. This shall actuate the brake camshaft, which in turn shall operate the
foundational brake mechanism forcing the brake pads against the brake rotor.
AIR COMPRESSOR
The air compressor provided for the engine shall be a Wabco
®
SS318 single cylinder pass-through drive type compressor
which shall be capable of producing 18.7 CFM at 1200 engine RPMs. The air compressor shall feature a higher delivery
efficiency translating to more air delivery per horsepower absorbed. The compressor shall include an aluminum cylinder
head which shall improve cooling, reduce weight and decrease carbon formation. Superior piston and bore finishing
technology shall reduce oil consumption and significantly increasing the system component life.
AIR GOVERNOR
An air governor shall be provided to control the cut-in and cut-out pressures of the engine mounted air compressor. The
governor shall be calibrated to meet FMVSS requirements. The air governor shall be located on the air cleaner bracket on
the right frame rail behind the officer step.
MOISTURE EJECTORS
Automatic moisture ejectors with a manual drain provision shall be installed on all reservoirs of the air supply system. The
manual drain provision shall include an actuation pull cable coiled and tied at each drain valve. The supplied cables when
extended shall be sufficient in length to allow each drain to be activated from the side of the apparatus.
(112 paginas)
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