Sudden howling while steering

Hello, I have heard a problem with my V40. And while I was earlier with my sister on a totally catastrophic traffic practice site, if that one was supposed to be at the construction site / crater mingled with the “road” scolding. Well, 1.5 std was all super. And after that, at a turn, it suddenly started to go to jails. As if you would drive 60 in 1 gear. It came but definitely from the steering. With every even so small steering motion it yawed off. I then broke off the whole thing there and drove out to drive to a gas station. There I have temporarily looked whether I could recognize what on the wheel. Then I Googled something and read that you should check them servo fluid times times if there is enough in it. I searched the container, found it? then screwed it on again, wiped the rod and ” dived ” in LUFT It was in it! I know now that the car can not buy and fill up now I have not heard anything else under me.