I had the same problem. I found a ground contact failure in a rear light bulb socket.
If you check this connector your problem will be solved.
If you have the same bulb for brake and signal, brake light power needs to be interrupted by the signal lights, The brake circuit has to go through the signal light switch so the problem could be there.
Its under the motor
i have a 72 nova and the left turn signal blinks faster than the right what is my problem
An ABS light on the 2002 Volkswagen Polo refers to the assisted brake system. When the light shines it means there is something currently wrong with the brake system and should be serviced.
In many cases, the brake light and the turn signal use the same bulb.
Check bulbs, fuse, brake light sensors.
see link
most likely a bulb b/c if it was the fuse your other brake and signal light wouldn't work... most vehicles the brake and signal light are all in one bulb... try replacing the light bulb
possibly have a brake light out
short circuits in the turn signal and brake light circuits
If only the right rear brake/signal light is effected it is not the fuse. Inspect the right rear brake/signal bulb, socket and wiring.
i have conected the black and red wire to the brake and it works (the brake light that is) and i conected the blue and white to the signal lights each wire being left and right signal and it all works. but when i brake all of the light lights up the red bar for the brake and the orage bars left and right when i signal left or right whiles braking the signal works but the other signal light sticks on with the brake light. so if any one as any idears please let me know thanks