The BTV function allows the autobrake to modulate the braking as required to allow the aircraft slow down to a safe vacating system at an exit previously selected by the pilot.
The A380 visit to AirVenture 2009 (Oshkosh) was an example of this. Only 1 r/w exit could accommodate the A380 and the r/w was too narrow for a 180 and taxiback. They did their sums quite well, thank you, and made an appropriately spectacular arrival.