Gasps echoed across a court room filled with dozens of teens involved in a crash as they watched the moment a truck with faulty brakes ploughed into their school bus.

Four young girls left with debilitating injuries and their loved ones spoke of physical and emotional trauma as the truck driver who caused the 2022 crash appeared on a screen mounted above them.

"Unfortunately, I remember every second of the impact," a girl who was aged 15 at the time, who cannot be identified, told a Melbourne court.

"I hear everyone's screams when I hear a truck on the road, smell diesel leaking out every time I'm on the bus.

"I can never forget the bodies flying as we went down the embankment."

A mother of another 15-year-old student took aim at truckie Brett Russell's conduct in the criminal case.

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