I know there are a lot of brake light threads but just wanted to put some info all in one spot regarding changing it.
First off this link to removing the knee bolster: http://www.benzworld.org/forums/w140...e-bolster.html
Brake switch part# 0015450109 Current $34.38 from Dealer or around $10 from Ebay
My ABS/ETS etc lights were on but my brake lights worked. Learned from this site to depress the pedal, then turn key on, start car with the pedal still down. If the lights stay off until the pedal was released then its the brake switch.
I took the switch apart to find one of the contacts physically broken in the switch.