Hello Dr. VladM. First of all, your seat locks electricaly. Which means if it were an electrical problem, you wouldn't be able to open it. That being said, it would appear that the locking mechanism might need adjusting. As for the Handbrake. You need to make sure that the Steering is turned completely to the left with the key in the locking Position and the Handbrake lever in the upward Position. Then when the key is removed, you shouldn't be able to move the lever until you put the key back in and unlock it. If this is not the case and you are still able to move the lever up and down then the locking mechanism might be broken. I hope I was able to help you with your Problem. Please let us know if my advise was helpful in any way.
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