Not sure what the safety features were on that model....brake set, in park, or anything else. Sounds like one of those features have gone bad, is disconnected or out of adjustment. Owners manual should give the parameters for the top to operate.
Panama City, Fl.
I wake up in the morning with nothing to do and by supper time, I have half of it done.
2000 Lightning, s/c, tuned, Basanni, built tranny
Sold them all.....
Previous Mustangs:4 - '66 Coupes(silver/blue/grey/red) '87 GT HO, '00/'02/'07 GT Vert(red)(grey)(black), '68 Coupe, '11 GT/CS, 08 GT Vert