Anti-Lock Brake System

The Antilock Braking System control module is a microprocessor that runs diagnostic checks of a vehicle’s ABS. It processes information from wheel-speed sensors and the hydraulic brake system to determine when to release braking pressure at a wheel that’s about to lock up and start skidding.


The system prevents skids when braking, and stability control intervenes to prevent skids even when the brakes aren’t applied.

ABS System
ABS System




A dashboard ABS warning light is supposed to come on for a few seconds every time a vehicle is started, but if it comes on while you’re driving it signals that the control module has a fault, a wheel sensor has failed or another problem has developed.



How do I know if my ABS system is not working?


A warning light for the ABS is supposed to illuminate briefly every time you start your car. If the warning light stays on, that means the anti-lock system has been deactivated because of an electrical or mechanical malfunction. Your vehicle’s regular brakes should operate, but the anti-lock feature that prevents wheels from locking up during braking will not work. In addition, if your vehicle has stability control and traction control, those will be disabled too because they rely on the same wheel-speed sensors as the anti-lock system.


How often should I replace my ABS control module?
It’s the brains of the anti-lock braking system: a microprocessor that adjusts braking force to individual wheels to prevent skids based on signals from wheel-speed sensors. It is more likely that a wheel-speed sensor or other component exposed to the elements will fail before the control module, but as with other electronic components, it can happen. When it does, the anti-lock system will be disabled and an ABS warning light should illuminate.


Why do I have to replace my ABS control module?


Since the ABS control module manages the ABS, without it the ABS portion of your brakes won’t work. Before blaming the control module, ensure a mechanic has run a thorough diagnosis to confirm whether the problem is a loose or corroded connection or a component at one of the wheels.


Always ensure you scan the vehicle first to pin point the cause or location of the problem.


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