Yes, is it, press X.
But he handbrake have on spacebar is modern.
Sometimes this can happen that you accidentally press the spacebar to throw you out of the car while driving (accept action get out).
And by the way, try doing drifts with key X. :)
Please change the handbrake to press the spacebar.
In all games it is so, all people are used to it.
The action may still confirm via Enter or Middle button.
Thank you.
Some examples of problem with AI Driving (SetBehaviour SAFE):
Test 1
https://www.youtube.com/watch?v=_PH8xWCXa9Y
Test 2:
https://www.youtube.com/watch?v=n_L4SXRJSp4
Test 3
https://www.youtube.com/watch?v=Ahq8rPZ2nT0
Test 4
https://www.youtube.com/watch?v=MQo43gMcmLg