What to know about the Anti-Lock Control Relay:
The term “anti-lock control relay” is something of a misnomer. The relay doesn’t operate the controller – the controller operates the relay. The relay itself is in charge of operating the pump, which pressurizes brake fluid in the ABS system’s accumulator. If the relay fails, then the pump will not work and the fluid pressure in the accumulator will not build. The end result is that the ABS system won’t work.
Essentially, the anti-lock control relay is used to strengthen the electric pump in some types of ABS systems. This will vary from one system to the next, and is dependent not on the automaker so much as on the manufacturer of the ABS system.
Like other electrical components, the anti-lock control relay is subject to wear and tear. Over time, it’s possible that it will stop working, although pump failure is more common than relay failure, and fuse failure is more common than both. In all instances, failure means that the ABS system will stop functioning and the ABS warning light will illuminate in the dash.
Facts to Note:
All relays are subject to failure due to normal wear and tear.
The anti-lock control relay is not checked during any upkeep service, and will only be checked if there is a problem with the ABS system.
Many other problems can mimic symptoms of anti-lock control relay failure, including pump failure and blown fuses.
How to Fix:
The anti-lock control relay is confirmed to see if it needs to be changed
The faulty anti-lock control relay is detached
The new anti-lock control relay is fixed
The anti-lock control relay is tested for operation
The vehicle is tested to ensure proper operation of the anti-lock control relay
The anti-lock control relay is in control of sending electricity to the ABS pump, which pressurizes the accumulator. Without an operational relay, the pump cannot function and the pressure inside the accumulator cannot be sustained. The brakes will still work, but you will have to exert more effort to apply them. Have any brake system problem diagnosed and fixed immediately by one of your expert mechanics.
Common symptoms indicating you may need to change the Anti-Lock Control Relay:
ABS light is on
ABS pump does not operate
ABS system does not operate
Importance of this service:
Anti-lock brake failure can cause increased stopping distances, and you may not be able to dodge a collision. The anti-lock control relay is in charge of operating the pump at the command of the control unit. Relay failure means that the entire ABS system will be inoperable, although you will still have normal (manual) braking capabilities. Seek immediate professional analysis from one of your expert mechanics to determine the actual cause of any ABS problem and have it fixed straightaway.