RIDEX 412W0153 ABS sensor

Description

The Audi ABS sensor, a crucial component of your car’s Anti-Lock Braking System (ABS), plays a vital role in ensuring safe and controlled braking, especially on slippery surfaces. Here’s a quick breakdown:

Function:

• The ABS sensor acts as the eyes of the ABS system. It monitors the rotation speed of each wheel, sending this information to the ABS control unit.
• By comparing the speeds of all four wheels, the ABS unit can detect when a wheel is about to lock up during hard braking.
• If a wheel is at risk of locking, the ABS unit signals the ABS pump to modulate the brake pressure for that wheel, preventing it from locking and allowing it to maintain traction with the road.
• This prevents skids and loss of control, even on slippery surfaces like ice or wet roads.

Location:

• Each wheel has one ABS sensor, typically mounted near the wheel hub or on the axle.

Types:

• Active sensors: Generate their own electrical signal using a magnetic field. More common in modern Audis.
• Passive sensors: Rely on a magnetic ring on the axle to generate a signal when the wheel rotates. Found in older Audi models or some budget-oriented options.

Signs of a failing ABS sensor:

• Warning light: An illuminated ABS warning light on your dashboard usually indicates a problem with the system, including a faulty sensor.
• Reduced braking performance: Spongy brake pedal, longer stopping distances, or ABS not engaging can be signs of a malfunctioning sensor.
• ABS activation on dry roads: The ABS system engaging unnecessarily on dry pavement can indicate a sensor issue.

Maintenance:

• While generally maintenance-free, the ABS system, including the sensors, should be inspected periodically as part of your car’s regular service.
• If you suspect a problem with an ABS sensor, it’s crucial to have it diagnosed and replaced by a qualified mechanic to ensure safe braking performance.