The vast majority of machines do and have done for a long ti
Hotpoints used to have 3 until 1981 I think.
Our WM52 was used for months with bad brushes (yes the wash results were awful, but we were living in Germany and couldn't get parts or a repairman) and it never damaged anything else on the machine.
The Ecologic also did a couple of loads on its bad brushes, totally fine, so I don't think you will have blown the timer, it's just a remote possibility.
Matt