They were on when I bought truck. They told me they replaced some part of brake. Lights went out, then came on an hour after leaving dealer.

Update from Jun 4, 2018: When i first bought the truck,they told me they replaced the brakes,that's why the light is on.well a week after that the and light came on.never went off. Had it looked at.couldnt find prob. Now iv been in wreck.could b or not b cause

I HAVE HAD ALL THE NECESSARY SERVICE DONE TO THIS SUT, I ALSO PURCHSED THE GM "VALUE GUARD" EXTENDED WARRTNTY. THIS WEEK I TRIED TO HAVE THE WHEEL SPEED SENSOR REPLACED UNDER MY EXTENDED WARRANTY POLICY, I WAS TOLD BY THE DEALER [BOB STALL CHEVROLET] THAT IT WAS NOT COVERED EVEN THOUGH MY POLICY SAYS IT IS.