Lighting problem

Absolutely a problem in the 4 way/ TS switch can cause the brake lights not to work.

I think that maybe the problem. I just found this posted by Redfish which is the same problem im having but the wires for my rear lights are green and brown instead of green and yellow.

You should find a off white wire feeding power up the column to the signal switch . If there is no power comming back down on green and yellow wires in same connecter... there's your sign :(
Signal switch is about 60.00 average and it takes half a tool box full of stuff to change it. Good luck