Anti-lock brakes are designed to prevent skidding
and help drivers maintain steering control during an
emergency stopping situation. In cars equipped
with conventional brakes, the driver pumps the
brakes, whereas in cars equipped with four-wheel
ABS, the driver keeps a firm foot on the brake
allowing the system to rapidly and automatically
pump the brakes. Because the wheels don't lock
up, drivers have the ability to steer around hazards
if they are unable to stop in time.
When the braking force created by the driver is
greater than the tire can handle, the wheel can lock
up. Locking wheels can create vehicle instability
problems and prevent steering around obstacles in
the road. Stopping distance on many slippery
surfaces will also increase with locked wheels.
Four-wheel ABS prevents wheel lock-up in
situations in which the wheels might normally lock,
such as on slippery roads.
ABS can also prevent tire damage. Locked wheels
on dry asphalt or concrete can quickly create flat
spots on tires, which can cause an annoying
vibration while driving.
ABS Brakes Operation And Description
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When a driver operating a four-wheel ABS-equipped vehicle steps
firmly on the brake pedal, the system automatically modulates the
brake pressure at all four wheels, adjusting pressure to each wheel
independently to prevent wheel lock-up.
With ABS, stopping distances decrease in many cases and the
driver can maintain steering control of the vehicle. Importantly,
four-wheel ABS allows the driver continuing control to help steer
around hazards if a complete stop cannot be accomplished in time.