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See Automatic Transmission
Brake components that automatically take up wear to keep brake shoes or pads close to the drum or rotor.
A carburettor component using a bimetallic strip that operates at low engine temperatures to improve cold start and idle performance. Operates independently of the driver.
A vehicle gearbox with automatic gear shifts based on engine speed and load conditions. Does not require individual gear shifts by the driver.
Auxiliary Air Flow
Used to describe a flow of air that bypasses the normal route. It is used to control idle speed or idle mixture.
Auxiliary Air Valve
A valve used to control auxiliary air flow.
Components that are outside a specific system. For example, when working on the engine, an alternator would be described as auxiliary.
Extra, non-essential lights such as front spotlights or driving lights.
Shafts that are used on some engines for balance or to drive other components.
A diode that conducts when a value voltage is applied. Used to protect circuits from overload.