There's two thing at Bromont: there downhill that you have to buy a ticket the ski station, all the infos are here:
http://www.skibromont.com/velo/en/bi...ain-biking.htm
And there's also the bike path Estriade that connect with other bikepath that goes thru Bromont and that can take you across the whole province (almost) some info here :
http://www.estriade.net/index.php?lang=en