I just had a brain fart while reading the threads about this very annoying recurring failure issue even after replacing the two switches.
Has anyone attempted to use a low pressure Brake Switch manufactured by Painless Performance, TX?
I would think the pressure activated micro switch on the current OEM/Aftermarket part fails after it gives out over time and usage. In our case a very short time. I figured a low pressure switch would solve this issue since some of us have to put allot of pressure to activate the failing switch.
According to the manufacturer/vendors Low Pressure System works at 20-50 lbs. vs. 60-120 lbs. of pressure of the standard OEM/After Market systems.
I emailed their tech support for verification.
Found this link from a Volvo electronics expert. it confirms some of you recommending to go Mechanical, very detailed with a switch cut in half and animation of a Bosch system. It is his belief that it is faulty electrical design:
http://www.sw-em.com/hydraulic%20brake%20light%20switches%20notes.htm