- A -

AAMA

An acronym for the American Automobile Manufacturers Association.

AAP

Auxiliary acceleration pump.

AARA

An acronym for the Antique Auto Racing Association.

AAS

Aspirator air system.

AATS

Ambient air temperature sensor.

AB

Air bleed.

ABCD

After bottom dead center.

ABCM

An acronym for anti-lock brake control module. Some refer to it as anti-lock brake computer module.

ABCV

Air bleed control valve.

Abnormal Operating Conditions (AOC)

Adverse weather conditions, such as rain, snow, sleet and ice.

Abnormal Wear

The excessive wear on a drive or driven member as might be caused by improper tensioning, misalignment, or abrasive materials in the drive environment.

Abnormal Wear Pattern

A visual indication that two or more members, such as gears, pulleys, and/or belts are improperly tensioned or aligned or that abrasive materials are present.

Abort

The procedure for intentionally terminating a computer program when a mistake, malfunction, or error has occurred.

ABPV

Air by-pass valve.

Abrasion Resistance

A treatment of a wire covering's ability to resist surface wear due to mechanical damage.

Abrasive

A very hard substance used for the removal of material by cutting, grinding, lapping, or polishing metals.

Abrasive Finishing

Any of several processes for removing scale or surface contaminants using abrasives, such as bonded grinding wheels or disks, coated abrasives, honing stones, or bonded abrasive sticks.

ABRS

Air bag restraint system.

ABS

An acronym for Anti-Lock Braking System.

ABS Event

A rapid reduction in speed in which one or more wheels begin to lock up.