Route M90 opertates between Burwood and Liverpool via Strathfield, Chullora, Bankstown and Milperra.
The former 486 and 860 routes were amalgamated in September 2006 to form a single route 900. In December 2010, the 900 was included in the then Metrobus network and renumbered M90.
The M90 runs every 10 minutes during peak periods, 15 minutes during off-peak weekday periods, and 20 minutes on weekends. It operates between 6am and 8pm daily. Transdev operates the service out of their Bankstown depot using 12.5m buses