My ABS light is always on. I just changed the front disc brakes and pads (calipers are two years old and had my friend from Mercedes-Benz inspect them), and changed my disc brakes and pads in the rear 6 months ago, calipers also okay. I use AutoZone's Duralast discs and pads, but I do always get the anti-lock brake discs. Never got the non anti-lock ones anyway.

What could this problem possibly be?

Thanks.

 

It won't have anything to do with the calipers or pads. The ABS computer self-checks the wheel sensors and the hydraulic module.

Check the wheel speed sensors and wiring for damage or being unplugged. Check that the CV axles are the ABS type-- they have teeth on the outside of the joint to actuate the sensor.

It should work that if you put a test jumper in the same place as for the ECU, the ABS light will blink out the trouble code. Would have to search for further info on that procedure.