Several hundred youngsters had gathered in a dilapidated building at the racecourse site to attend the party.
The police decided that the safety of the party-goers could not be guaranteed and a decision was made to bring the rave to a premature end.
Dozens of officers from across Flemish Brabant were drafted in to help close down the party. They first surrounded the race course before raiding the party.
The party-goers were escorted to Hoeilaart railway station and by 4:30am the site had been cleared.
The police report no incidents having taken place during the operation.