Brass credits watching Randwick scrumhalf prodigy Ken Catchpole in action at the Sydney Sports Ground in 1959 as the early inspiration for his wanting to play rugby.
Partnering with veteran centre Dick Marks through all the internationals, Brass scored his first Test try for Australia against Scotland at Murrayfield.
[5] In the 1968 season, he played alongside Randwick centre Phil Smith in the 1st Bledisloe Cup Test 11–27 loss to New Zealand and the 11–10 victory over France in Sydney and was selected for the 1968 short tour of Scotland and Ireland, playing in the 3–10 defeat to Ireland and the 3–9 loss to Scotland.
[10] He was part of the Roosters' premiership winning sides of 1974 and 1975, kicking two goals in the 1974 Grand Final and scoring two tries in the 1975 decider.
During the 1976 NSWRFL season, Brass played as a centre for Eastern Suburbs in their unofficial 1976 World Club Challenge match against British champions St. Helens in Sydney.