More than four decades after winning the Inter Dominion Trotting Championship Grand Final, master Kiwi horseman Richard Brosnan has done it again with son Emmett by his side.

There were scenes of jubilation at Tabcorp Park Menangle as Maori Law scored a gutsy front-running success in the time-honoured feature for star Victorian driver Greg Sugars.

“My whole life,” an emotional Emmett said when asked if this was the race he wanted to win more than any other.

“I was getting more confident as the series went on. We had him about 90 per cent going into that first heat, then he started hitting his straps the last couple of heats and Dad said ‘he’s on here’.

“It’s a pretty team effort, but Dad stayed up with him and did a really good job with him. Travelled with him and everything.”

Maori Law was sent to the front quickly after the start by Sugars and that’s where he stayed for the remainder of the 3009m trip. He sprinted best in the run to the line to hold out Majestic Man (Phil Williamson/Anthony Butt), who took the trail throughout the race. Victorian Just Believe (Michael Hughes/Rodney Petroff) sat three back the pegs and got home well for third.

New Zealand native Richard Brosnan trained and drove No Response to victory in the 1979 Inter Dominion Trotting Championship Grand Final at Addington. He recently moved to Australia and started up a partnership with son Emmett in Meredith, near Ballarat.

Maori Law, who won his third ID heat at Newcastle, was well backed and eventually ran favourite in this evening’s Group 1 final.

The eight-year-old son of Lawman is raced by prominent Victorian owner Fred Crews and has now won 20 races for more than $300,000 in prizemoney.

Kialla driver David Moran then had the Inter Dominion Pacing Championship Grand Final taken off him after stewards deemed first-past-the-post Expensive Ego had cost Boncel Benjamin the race by impeding his run in the home straight.

It was the first upheld protest in Inter Dominion grand final history.

Moran's loss was Victorian owners Julie and Steven Duffy's gain, with the couple celebrating news of the result trackside.

Steven Duffy was the original trainer of Boncel Benjamin, who was sent to Jason Grimson's Menangle barn in September.

The horse, who had run in only one Group 1 event before Saturday night, has now won 17 races and close to $500,000 in prizemoney.