My brake pad light went on my 300E today. It only comes on once the pedal is pressed on all the way down. Under slight braking it doesn't go off. Is it the sensor or brake pads. By the way, I got the s600 yesterday. What a car!! Feels like a Porsche. The luxury and performance has no equal.

2001 S600
1999 S420
1997 E320
1996 SL600
1989 300E