Might also want to check...
the brake light switch. Possible the switch is bad or out of adjustment, and has been that way for a while, keeping the brake lights on all the time. If the left and center lights have burned out, then they wouldn't come on when the pedal wash pushed.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.