a little question about the Yak-52

Where is the handbrake in the front cockpit ( I don't speak about the little lever on the stick to use wheels brake by hand but the system to switch brakes in a permanent locked mode, to do engine tries at the waiting point in exemple, without pressing brakes permanently with feet) ?

You need to bind the "wheel brakes lock", which will allow you to lock the brakes :)

You can look at page 27 of chucks' guide of the Yak-52 here : https://www.mudspike.com/wp-content/uploads/2019/02/DCS-Yak-52-Guide.pdf

Ok thanks !