Parking brake release button.
Porsche 911/912 '65-69
Porsche 911T/E/S Carrera RS '70-73
Porsche 911/911S / Carrera '74-77
Porsche 911SC / Turbo '78-83
Porsche 911 Carrera / Turbo '84-86
Porsche 911 Turbo '76-77
Porsche 914 '70-76
Porsche 959 '86-87