The brake lights on my 2011 mk8 polo are not working . Fuses checked , bulbs checked and new brake light switch fitted but still not working . Has anyone got any ideas please . 

Edited 30 May, 20215 yr by nige8021
Model changed to reflect the forum numbering

I have two ideas

• corroded bulb holders
• combined brake and tail bulbs 5Wand 21W filaments in one bulb fitted the wrong way round

Needs a multimeter to test there's 12volt reaching the bulb and low/no resistance to earth.

Thanks I have a good earth connection. With a volt meter I get no voltage on the brake lights circuit on both light clusters and high level brake light .

 The wiring loom has been followed from the back of the car to where it goes up under the dash in the passengers foot well and tested with a continuity tester. 
still nothing 

12v at the brake light switch?

 

Is the switch activated by pedal on mk8?

Sorry, not familiar with newer models.

The Pedal switch signals the engine ECU  and that sends the signal via the CANbus to the onboard power supply unit and that outputs to the brake lights 

 

The pedal switch has both a 12v supply (pin 4 Blue/Yellow wire from fuse #33) and a ground ( pin 2 Brown wire)