Check your axle seals. If you see that the inside of the rotor cover plate or axle near the rim looks wet you prob have a bad axle seal. When they leak they can get a little gear lube on or near the wheel sensor causing brake dust and other trash to accumulate. This can make the slip light come on as the computer doesn't read it. Hopefully that's not the issue but that's how I caught my leaking seal about a year ago.
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