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that would mean that the wiring is shorted together under the fuse/ relay box or one of your friends wired them together as a prank seen it befor. the easy way to confirm that its the problem is take a ohm meter and go to the fuse box and put one led on the fuse for the brake switch and the other led on the fuse for the horn and see if there is resistance the shouldnt be any at all
Remove the brake light switch from the pedal assembly by turning 90 degrees. Pull the plunger out until it clicks one or two times. It can take some force, but your hands are strong enough. Re-install buy putting into the lug and turning 90 degrees.
The switch is self adjusting and sometimes the brake pedal hits its hard enough for the adjuster to click back in, leaving the brake lights on all the time
Is it a manual or auto? Assuming its a manual, is there an ABS light on? If so or if you hace changed the brake pads recently or even had the tires off or rotated, there could be a problem in the brake pad sensor or abs wheel speed sensor.
Check with Porsche service (your closest dealer) for recalls or TSB (Technical Service Bulletins) related to your concern and check the cayman/boxster owners clubs for similar posts and resolutions.
POSSIBLY SWITCH THAT RECOGNIZED PARK BRAKE ON OR POSSIBLY BAD MOTOR. YOU CAN GET A TEST LIGHT AND PROBE THE CONNECTOR FOR POWER AND HAVE SOMEONE ACTIVATE MOTOR TO SEE IF ITS A PWR PROB OR MOTOR THATS BAD. MAYBE PLAY AROUND WITH PARK BRAKE,MAYBE SWITCH JAMMED OF STUCK AND NEEDS JARRING TO ACTUATE.
That leaves the microswitch or the wiring.Verify microswitch is working first and the check wiring continuity. The microswitch closes as you press the pedal and transfer power to brake lights.
If the microswitch is O.k then it will be the wiring that is at fault.