I just had the same problem and solved it by purchasing a new switch from British Parts Connection. I don't recall the price, but seems like it was $15 or so. It is also available from several other sources such as Victoria and Moss. There are two types: The later BJ8s use a switch with a blade connection for the wire connection and the others are connected with screws. The location is on the right wheel well area below the horn. Not difficult to replace, but I went ahead and removed the horn first to make access easier. Additionally, it is a good idea to "fill" the switch with fluid prior to installation as there would otherwise be an air bubble with resultant heavier brake pedal exertion needed to make the lights illuminate. Good luck! Replacing a switch is much easier than other solutions if it isn't the switch! Steve