It first started coming on then would go off no it stays on. It doesn't come on when I brake it only comes on when I taking off remotely fast. About four months ago I put A New Master cylinder on my Truck. It does have early ABS on it I Don't know how to test this does anybody. I haven't had any trouble stoppping made several hard to light brake checks they seem to be working just fine. some body tell some thing please. Thanks chopperpad