On the subject of brake use generally. It might be useful to be aware that some pilots in the simulator (and by association in the real aeroplane) have been known to inadvertently apply light braking during the take off roll, but without being conscious of it happening.
During the landing run, some simulators automatically display a page on the instructor panel that shows the brake pressure on each set of wheels being applied by the pilot at any instant. This same page automatically pops up if the pilot is (for example) unknowingly touches the brakes during the take off run.
During the simulator training of two cadets on a 737 simulator, the sequence included practice at rejected take off procedure at 100 knots. The simulated runway was reduced in length such that if the rejected procedure was conducted correctly the aircraft would come to a stop with 100 metres to spare.
While one cadet performed the rejected take off perfectly and stopping with 100 metres to spare , the other cadet would invariably overrun the end of the runway while still performing the actions swiftly and accurately. This had the instructor mystified until he by chance happened to be looking at the instructor screen while the cadet was in the middle of the take off run.
There was no specific reason for the instructor to look at his screen at that moment during the take off run - it just seemed a good idea at the time. What he saw surprised him. The brake pressure readings were popping up intermittently on the screen during the take off run. This could only mean the cadet was unknowingly touching the top of the brake pedals during the take off roll.
The extra drag caused by intermittent brake pressure had extended the take off roll. When at 100 knots IAS, the rejected take off procedure was started, the aircraft was already further down the runway that it should have been with a normal take off run. This explained the instances of the over-run.
The cadet was then reminded to keep his feet low on the pedals during the take off roll and it was explained to him he had his feet too high on the pedals thus causing inadvertent brake pressure. The cadet refused to believe this was happening and denied he had his feet too high up on the rudder pedals. This was a prime example of ethnic culture or loss of face at work.
In the end the instructor asked the PM to get out of his seat and observe what was happening on the brake pressure page during his colleagues next take off run. When it duly happened yet again, the instructor asked the PM to tell the offender in his own language what was happening re partial brake pressure on the take off roll. That satisfied `Face` and after that, the box was ticked off and there were no more problems.
In the simulator it is difficult for an instructor sitting at the back to see the exact position of a student's feet on the rudder pedals especially during a night take off scene. Hence it is useful for him to occasionally glance at his own screen to see if inadvertent brake pressure is being applied to the rudder pedals during take off. V1 could become invalid if the brakes are being dragged even slightly. And of course the brake temperatures could rise,