Your car's anti-lock braking system that prevents the wheels from locking during braking relies on a computer known as the ABS control module to run correctly. The ABS control module must be working properly--otherwise, this feature in your car might fail and put you and your passengers' safety at risk. Keep reading on to learn more about the ABS control module and what to do if yours is giving you issues.

Components of the Anti-lock Braking System

The anti-lock braking system is made up of a number of parts and valves in each of the brake lines. The ABS sensor detects the speed of the rotating wheels and feeds the information to the control module; the ABS motor restores lost pressure to the braking system after a valve has been released to avoid locking up, and the main control center--the ABS control module.

Functions of the Control Module

When the sensor detects a loss of traction or imminent skidding, it sends a signal to the ABS control module to intermittently brake to restore control. The following are the functions that the control module carries out to realize this process.

Wheel Speed Monitoring

The ABS control module is alerted by a sensor when it detects that one wheel is rotating significantly slower than the other wheels. This discrepancy typically occurs during hard braking or on slippery surfaces. When the module receives this information, it automatically adjusts the braking pressure to that specific wheel, preventing it from locking up.

Brake Pressure Regulation

Once alerted, the control module first releases pressure from the wheel to allow for smoother operation and prevent skidding. Once the pressure is released, the module then promptly reapplies the brakes with precision, ensuring optimal control and safety during braking.

Traction Control

By intermittently applying and releasing the brakes, the control modules effectively manage wheel traction, allowing the tires to regain grip on the road. This technique is particularly useful in slippery conditions, such as wet or icy surfaces. As the brakes are released, the tires can re-establish contact with the pavement, optimizing traction and enhancing overall stability.

Diagnostic Capabilities

The ABS control module continuously monitors the performance of the ABS system, which helps prevent wheel lockup during hard braking. If it detects any anomalies or malfunctions, it will illuminate a warning light on the dashboard to alert the driver. This warning light indicates that there may be an issue that could affect braking performance.

How to Choose ABS Control Modules

Vehicle Compatibility

To guarantee a proper fit and the original level of performance, ensure that you're getting an ABS control module specific to your vehicle, as they can differ between models and even model years.

Aftermarket or OEM

Original Equipment Manufacturer (OEM) ABS control modules are typically made by authorized manufacturers, whereas aftermarket ABS control modules are made by third-party manufacturers.

We recommend investing in OEM ABS control modules to return your vehicle to its original level of performance. Because of the more stringent levels of manufacturing, you'll likely get more use out of an OEM replacement. Not to mention, aftermarket units may void your vehicle's warranty.

Symptoms of a Failing ABS Control Module

ABS Warning Light Turns On

In most cases of ABS control module problems, the ABS warning light will turn on.

Unresponsive Brake Pedal

With a faulty control module, the brake pedal might become unresponsive. Contaminated or low brake fluids could also cause this, so check with a mechanic.

Brakes Lock Up

The ABS might not function as intended and not be able to prevent the brakes from locking up. Additionally, it might behave erratically and cause locking up even under normal conditions.

Increased Pedal Effort

The brake pedal doesn't need much effort to activate with a properly working ABS control module. When faulty, you might need to expend more effort to get the same level of braking.

Inaccurate Speedometer Readings

In rare cases, a faulty control module might result in inaccurate speedometer readings, such as showing the wrong speed or 0.

Routine ABS and Control Module Maintenance

Brake Fluid Checks

Low levels of contaminated brake fluid can compromise the efficiency of the braking system and the ABS. Regularly check that there is enough brake fluid and that it's clean.

Brake Inspections

You should also check the brake pads and rotors to see if they are in poor condition, as the ABS has to work hard to prevent the wheels from locking up.

Sensor Checks

As the ABS sensors are responsible for detecting if a wheel is about to lock up, you should also make sure that they are clean and working well.

Avoid Harsh Braking

Harsh braking can put unnecessary stress on the braking and ABS. Practice good driving habits so that you can avoid harsh braking and prolong the lifespan of the brakes and ABS.

Replacing Your ABS Control Modules

If you need to replace your ABS control module and are not experienced and don't have the right tools, you might want to leave this job to an automobile professional. Otherwise, you can carry out the following steps to remove and install the ABS control module, assuming you have the correct model of the ABS control module.

1. Release the electrical connectors and remove the mounting bolts before removing the old unit.
2. Ensure that the pump motor is clean and free from dirt.
3. Install the new unit and make sure it sits flush with the valve assembly.
4. Reinstall the mounting bolts and reconnect the electrical connectors.
5. Reconnect the negative battery cable and start the car. If you've done the job right, the ABS, Traction Control, and warning lights should turn off shortly after.

Where to Buy Quality Used ABS Control Modules

Buy a used ABS control module in good condition and at a competitive price with Japan's leading auto parts exporter--BE FORWARD Auto Parts today!