Note on anti-skid brakes:
Aircraft making a full performance stop with the use of anti-skid brake systems usually leave skid marks. The hydraulic pressure is rapidly cycled to prevent the wheels from 'locking up'. Braking Coefficient of a locked wheel is less than that of a turning one. A turning wheel will still leave rubber behind if it is turning at a rate which is less than that required by the forward movement of the aircraft. Anti-lock brakes would be a better name. Examine photos from most runway excursion incidents and you will see skid marks. You may see 'chattering' of the marks which is another indication of system operation. If you see long spans of nothing it is because the pilot may have started to pump the brakes in a futile attempt to stop - or there was a system malfunction.
Try not to armchair quarterback on incident or accident too much before the official report and remember: Accidents are usually the result of more than one thing/ system malfunction (brakes, spoilers, reversers)/ unexpected wx / poor briefing / unexpected distractions / fatigue / etc etc..