First of all, press on your brakes levers, and listen for "clicking" sound to see if the switches change their state. The rear one is harder to hear, you will need a silence environment.
If one of them does not seem to "click" the problem probably come from that one.
If you get no good result with this, disconnect the front one (easier than the rear one) then check if the light is still ON.
If not, the problem is from this one.
If yes, the problem is from rear one.
Could be ajustment or defective switch but at least now you should know wich one.
Removing the front one is easy, just a srew under it. I think you need to remove the footpeg bracket to have access to the rear one. (But you should be able to turn the plastic ajustment nut with your fingers without remove the bracket.)
Last edited by fortp; 11-24-2012 at 01:00 PM.