Re: 991 GT3 RS
The electric parking brake should work even without calipers (has separate brake shoe inside the rear rotors). And of course putting the transmission in park would be a second way to prevent this. Maybe neither of these stopping methods work when the car is moving??? Old manual parking brakes are missed more than I thought...
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16 Cayman GT4, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi