Thanks for all your answers :-) Nice to know that one's able to sense locked-up brakes in an aircraft as well.
May I ask another question, just for the sake of it? Let's take a stationary widebody aircraft at MTOW. Lock up the brakes and go to TOGA. Will it move?
Will a narrowbody aircraft move?
Will any aircraft move under these circumstances?
I'm thinking of cars right now and that Audi-Toyota-unintended-acceleration-debacle. In a car, your brakes will always overpower your engine. Is that also true in airplanes?
In trains? Well, if one in twenty brakes in a loaded twenty-car Jet A1 train (1850 long tons) sticks, you'll need something around 150 kilonewtons of force to get it going from a dead stop, instead of around 25 kilonewtons if everything's all right. Three stuck brakes out of twenty, and you sure won't go anywhere. In my business, brakes will definitely overpower your propulsion.
to repeat myself - thanks for your enlightenment!