low brake pad light on dash won't go off. on 2006 Mercedes-Benz R350

Replaced the front and rear pads and rotors on a 2006 mercedes r350. after about 2 miles brake light on center counsel came on and won't go off. Checked sensor it was installed properly. Checked and found 5 volts power going to rear sensor and was told there should be none. Is this true and if so what parts and procedures are required to fix this problem.

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1 answer
did u repl the sensors?