Ok, there is this steep hill on the way back from work with some traffic lights on it. Over the last couple of days, especially in the wet, my stop light has come on whilst i have been waiting by the lights with my handbrake on. When i then go to drive off i spin the wheels a little because i need some power to get up the damn hill, and the stop light and handbrake light flash on and off for a few seconds. When i get past the hill everything is back to normal.
Any ideas?