I suppose you mean the led light above back window. I have managed to change mine today. (when vw service people willing to change for £70!!). There is not a bulb on this light. I've bought completely a new led light for about £25.
I use couple of screwdriver to pull out the light completely. It is quite hard to do it and few scratches appear around the light rim. If you have got better tools it might not happened. When light is out you'll see a cable attached to the light, you just pull the cable while pull the little thingy up (as if telephone socket). Then, replace the new light to push it firmly in its place until you hear click sound from it. Good luck.
its very easy open the hood and remove the carpet from the light there will be 2 bolts the whole light unit will come out and then replace the bulb .
Check the fuses. You'll probably need to replace the 20 amp fuse.
You have to get a new brake light switch!
You can reset the brake warning lights, on your VW Jetta, by backing up 20 feet and using the brakes. The automobile will sense the new pads and the warning light will go off.
See sources and related links below for the brake lamp and light bulb list information.
brake pad warning light
To change the brake light bulb on a VW Golf MK4, first, open the rear hatch and locate the tail light assembly. Remove the screws or clips holding the tail light in place, then gently pull the assembly out. Twist the bulb holder counterclockwise to release it, replace the old bulb with a new one, and reassemble the tail light by reversing the steps. Ensure the new bulb works before closing the hatch.
Check the bulbs, fuse & brake light switch on the pedal.
try your brake light swtich on the brake pedal and check wires
carefully
i replaced a brake light bulb in my 2001 golf now none ofthe brake lights are working ! i can not tell which fuse is the one for the brake lights ! please help ?
From the inside of the hatch area uncover the light fixtures. The lamp carrier is held in place by plastic clips. Depress the clips to remove the lamp carrier. Replace the lamps as required and replace the carrier in the fixture. Check your work.