the check up of the tires: one sat in the car and the other one was with the tire and put a thing inside (while tires off). dont know how that works, but it probably took them more than 30 minutes to do that.
I am not a mechanic.
I am curious in getting to know how all that works.
Dont know how the fluid is distributed and shows up at/on the brakes or tires. Is there a sing of fluids there so that they can see it? hmmmm

The brake fluid has to go to all four tires and brakes or not? Only to the front?
Not that I am buying a part which I do not really have to. I will re-ask when I have to go back to the service garage and ask. Mostly mechanics assume and do not know for sure which part really has to be replaced or if.
With a SL it is all vaccumed tubes around. Easily to have one or so not working...