Bulbs?
Fuses?
Earths?
Brake light switch?
And as above a multimeter is your friend:)
J
 
Remove the panel from the drivers rear to expose the loom/Conections for both sides of the lights &
Check for power & working earths

You should have power at the rear if the fronts are working ;)
 
Back lights not working on mine after few months layup. It was the bulbs, green gunge and stuck in holder. Pliers to remove bulbs, new bulbs and all sorted.
 

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