I have had several spyders with hard to disengage parking brakes. There is now a parking brake recall for this issue.
I have also had several spyders with inop parking brakes. I haven't figured out why so many are failing so quick yet. I don't see any signs of driving with the brake on, which would be hard to do with the light on the gauge. But if you lose parking brake pressure, adjust the cable at the rear caliper. If the cable is out of adjusting room, remove the linkage arm, rotate the splines shaft clockwise until pressure is felt and align the linkage arm so that it is parallel to the stopper plate. Then adjust the cable as needed. Be sure not to have the parking brake drag when disengaged. Sometimes it is hard to tell. Roll the spyder every few turns of the adjuster and feel for the same ease of rolling.