Because there's a short somewhere in the system, and it's probably on the master cylinder. VW, for some reason, used a brake light switch that's activated by brake fluid pressure. The switch is under the car where it gets wet.
All bulbs blow after a while due to age. If they a re blowing constantly, you may have a short in the electrical system.
Blow the old brake dust out of the drum.
Yes December 27 1968
A short in the brake light circuit.
The trailer has a dead short in that right side brake light circuit.
Short to ground in the wiring harness.
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A blown fuse is always a sign of excessive current flow. In this case, it's probably caused by a short circuit in the brake light wiring.
because there is a short somewhere
air conditorner doesnt blow cold air has freeon compressor doesnt kick on
short circuits in the turn signal and brake light circuits
Check to see if water is getting into the brake light sockets causing them to short to ground