A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

ABS (Antilock Braking System) Computer, sensors and solenoid valves which together monitor wheel speed and modulate braking force if wheel lockup is sensed during braking. Helps the driver retain control of the vehicle during heavy braking on slippery roads.

AFV (Alternative Fueled Vehicle) Vehicle powered by a fuel other than gasoline or diesel.

Air brake A brake which is operated by air.  The air brake is operated by use of air lines, valves, tanks, and an air compressor.

Air Ride Suspension Suspension which supports the load on air-filled rubber bags rather than steel springs. Compressed air is supplied by the same engine driven air compressor and reservoir tanks which provide air to the air brake system.

Air Spring System A system whereby the container and plunger are separated by air under pressure  When the container and plunger attempt to squeeze together, air compresses and produces a spring effect.

Air Tank A reservoir for storing air for use in the air brake system  Without this storage tank there would not be enough air for braking when needed.

Ammeter A gauge which registers the output of the alternator or generator.

ATC (Automatic Traction Control) Usually an optional feature based on ABS, it prevents spinning of the drive wheels under power on slippery surfaces by braking individual wheels and/or reducing engine throttle. Also called ASR, an acronym sometimes loosely translated from the German as anti-spin regulation.

Axle Structural component to which wheels, brakes and suspension are attached. Drive axles are those with powered wheels. Front axle is usually called the steer axle. Pusher axles are unpowered and go ahead of drive axles. Rear axles may be drive, tag or pusher types. Tag axles are unpowered and go behind drive axles.

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