Like pineteam pointed out, it is only on certain aircraft’s - not all. While the 5 minute SOP is to prevent brake oxidation, the ones without the SOP are to prevent vibration when braking to a halt at low speeds when break temperature is above 200 degrees. Perhaps it is specific to a certain brake manufacturer? My memory does not serve me well at the moment but, I remember noticing it was specific to the Honeywell-ALS braking system?
@pineteam any idea who the brake manufacturer is for your company aircrafts?