What is an anti-lock control relay?
An anti-lock control relay is a part of your vehicle’s anti-lock braking system (ABS).
The control relay adjusts brake pressure for each wheel by relaying information from the ABS wheel speed sensors. The anti-lock control relay also sends power to the anti-lock brake controller, which signals the pulsation of brake fluid to the wheels.
In short, your anti-lock control relay is responsible for sending cues that help your braking system do its job.
When should I replace the anti-lock control relay on my car?
There are a few key signs that something may be wrong with your ABS control relay:
ABS light comes on: If the ABS light or check engine light on your dashboard comes on when you start your car, something may be wrong with your ABS system, including control relay failure. Your ABS light could also indicate low brake fluid, a faulty ABS speed sensor, or a worn down ABS pump.
Brake pedal responsiveness: If you notice reduced brake performance, or if you need to press down on the brake pedal several times to get the desired result, this could indicate a faulty control relay. A lackluster brake pedal can also result from air in the brake line or worn out brake pads.
How often should an anti-lock control relay be replaced?
Anti-lock control relays generally last up to 10,000 miles if the ABS system is correctly maintained. Replacement intervals also depend on the vehicle’s make and model, so it’s best to check your owner’s manual or consult with a mechanic or dealership.
Pro tip: Keep an eye on the electrical wiring around your anti-lock control relay, which is usually located in the engine compartment’s fuse box. If your wires and connectors are secure and free of corrosion, your control relay is likely in good condition.
Can I replace my anti-lock control relay myself?
Replacing an anti-lock control relay is fairly straightforward and doesn’t typically require any heavy lifting, so you could replace this part on your own. That said, there are a few tricky steps involved in the process, so you may be better off letting a certified mechanic replace your anti-lock control relay.