[narvik]

I've just noticed a very strange behaviour of auto-releasing airbrakes of MiG-15. Brakes are deploying at aproximately 850 km/h at 1000 m altitude,and at aproximately 650 km/h at 10 000 m altitude. In older thread on this forum PeterD said he'd been going to make brakes deploying at 0,92 Mach speed. I think it means that brakes should auto-deploy at 1130 km/h (1000 m) and 980 km/h (10 000 m). Am I wrong?