Driver side brake light

donerkebab

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Was just about to book MOT - notice driver side brake light is not coming on 2002 A3 1.8 SE

Taken apart the light cluster - worked out should be bottom of 4 bulbs in rear cluster. Swapped the bulb noticed 2 filaments - still no joy with brake on - but the bulb only comes with lights switch on. Is this a fuse/switch problem rather than bulb problem?