![]() If one or more wheels begins locking up (because you entered a turn too fast, for example), the ABS control unit will send electrical impulses that modulate (release and reapply) pressure at different calipers to allow some wheels to rotate faster than others. If there is no wheel lockup, then braking pressure can be applied to each of the four brakes through hydraulic means (meaning your brake fluid sends a command to the four calipers). The computer then decides based on the vehicle speed if it will apply braking pressure or not. The result is that ABS allows the driver to maintain control while braking, cutting down on the need for regular brake pad replacement and minimising stopping distances on all road surfaces and in all weather conditions.ĪBS works by having the vehicle speed constantly measured. Braking effort is modulated in response to these factors. Optimal tractive effort can be achieved depending on road conditions and driver inputs. The wheel speed information is relayed to the electronic control unit, which modulates the calipers via the ABS pumps. The valves are controlled by electrical servomotors based on information received by various wheel sensors throughout the vehicle. ![]() However, when a tire encounters less than full traction (when braking), much of the braking force is routed through the logic module, which modulates that portion of applied brake power needed to allow forward motion by preventing wheel lockup. When a tire is rolling freely, the ABS hardware applies the brakes at full force. It has been further refined with electronic computerised systems, which help with braking in low traction conditions by applying the brake to one or more wheels to prevent them from locking up in extreme conditions.ĪBS is an electronic braking system, which uses computer-controlled hydraulic valves to split and control the level of brake fluid pressure applied to each wheel. The abbreviation can also stand for Assisted Brake System. When the driver exerts a force on the brake pedal, the anti-lock braking systems prevent the wheels from locking up (ceasing rotation) and avoiding uncontrolled skidding.
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