My 2005 roadster got through pressure swithes with monotonous regularity. In the end I wired a mechanical swith replacement. I used a fridge light switch (reasoning that they're designed to carry 240volts and work about 3 million times before failing) to a small block of wood and fixed that in front of my brakepedal. It works perfectly. Shortly after I did it the factory changed to a professional version of what I'd done. I think they have a spy camera in my garage.
nick