Hi
Yes I know there are no parking brake on the SU-27 and I´m not aware if this have been discovered before. If so, I´m sorry to mention it again.
I discovered if you press and hold the wheel break start and then press wheel break short, release wheel break start, the wheel break start is locked as a parking brake.
To release it again simple press wheel break ones.
Don´t hope it´s a bug. It´s kind of useful
(Done in the beta)
Cheers