The Volkswagen Passat ABS Sensor checks the individual wheel rotation of the vehicle and relays the information to the brake control module. The brake control module alters the hydraulic pressure to the brakes to prevent the wheels from locking up and ensure steering control. Each ABS Sensor is fitted right next to a toothed ring on the hub, axle shaft, or differential gear. According to the ABS Sensor, as the ring turns, there will be a change in a magnetic field. This will cause the sensor to generate an electrical signal that will be proportional to the wheel's speed. Should one wheel's velocity decrease more than its partners due to braking, the module will limit pressure to that wheel. This restores default traction stability without compromising normal braking performance when there's no fault. Certain sensors utilize a permanent magnet in conjunction with a Hall effect element, while other sensors employ an electromagnetic coil placed adjacent to the toothed wheel. Although the two designs generate the same type of speed signal, they employ different internal components in order to do so. The performance is usually reliable, but very slow rotation may weaken the magnetic fluctuations and lead to a less accurate signal. When a fault occurs that causes the control unit to deactivate the anti-lock function, a dedicated warning lamp lights up, but as long as the general brake warning light does not light up, braking basically remains possible. In any braking situation, the ABS Sensor must signal consistently to ensure full anti-lock functionality. Volkswagen's advanced safety systems work seamlessly to deliver confidence under braking in all manner of conditions across the entire Volkswagen range, including all the recent Passat variants, a pedigree that assures owners of a Volkswagen.
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