have a problem with my back break light, light works but not when i use the front break, any idears what this could be????

I have many ideas, some of which are even serious ones!!

Basically, something along the circuit has gone.

Start by checking the switch on the front of your brake lever. Make sure it's plugged in - Some come off for fiddling about with the controls. Make sure your brake lever moves enough to close the switch and make the circuit, too.

Visually inspect the whole wiring and anything it's connected to, like fuses, switches, boxes, looms etc.

If this doesn't yield any clues, check each section with a multimeter.

have a problem with my back break light, light works but not when i use the front break, any idears what this could be????

So I guess your rear brake pedal makes the light come on but the front brake lever does not ? an idea would be to trace the green/yellow wire from the switch to see if its connected, but if the front brake lever has been replaced it's dead simple to not reconect the switch