The Antilock Braking System or ABS helps the driver maintain the steering control during hard braking. Without the ABS, a car would spin out of control when the wheels lock up during hard braking, especially on slippery surface. The ABS uses wheel speed sensors to monitor the speed of each wheel. If any of the wheels lock up during braking, the ABS quickly releases then applies the braking pressure to the affected wheel, preventing it from locking. If the ABS system doesn't work properly, you will see the ABS warning light on the dash.
An alternator supplies the electric power for the vehicle's electric systems and charges the battery when the engine is running. An alternator is attached to the engine and driven by a drive belt. If the alternator fails, the warning light or a red battery-shaped icon comes on in the instrument panel.
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