VW Polo Brake Light Switch

I was asked to investigate a problem on a 2003 VW Polo with a EPC warning light permanently on. On investigation the brake lights did not operate either. There was 12V from the brake light switch with no load but not when the lamps were connected.  The switch was replaced and after a couple of brake pedal actuations and ignition cycles the lamp went out without need for the diagnostic kit.

The old switch was examined and the contacts were pitted and well worn!