When putting on the front brakes on a 1998 audi a4 where does the sensor plug into?

onto the brake pad itself that is for the abs light.When putting on the front brakes on a 1998 audi a4 where does the sensor plug into?It does plug into the pad, but so that the rotor will break the contract when the pads wear down.

It is a wear indicator, not ABS indicator.

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