Brussels Airport uses a preferential runway system. Unless winds break certain limits, they continue to use 25L and 25R for active operations.
25R is usually used for take-offs, with the odd landing in between. 25L is mostly used for landings, with the VERY rare take-off in between. (Mostly heavies needing the longest available runway).
Until recently, the crosswind/tailwind component was respectively 15 and 5 knots. The tailwind component has been raised to 7 knots.
When these criteria are met, the preferential runway system is used:
DEP RWY ARR RWY
Mo-Fri 25R 25L
Sa 20* / 25R** 25R
Su 20* / 25R** 25R
On sunday, past 11pm local, RWY 20 is adopted for landing if conditions permit.