I'm kind of surprised at the variance in the tests there.
When a vehicle is tested here, there are very strict criteria to be performed with calibrated and tamperproof VicRoads issued equipment.
Firstly, the car must be photographed on the hoist (ramp) with its wheels off. Brakes must be photographed up close, VIN must be photographed, the Odometer must be photographed at both tests (if a second is required) to ensure a mileage difference, various other components and any 'fails'.
Secondly a g-meter type brake tester is used, and there is a minimum amount of 'G's' a car must perform to be considered safe.
The one comment made when the S8 was tested was "she's got good brakes"
Our system in Victoria is a little different as we don't have yearly MOT's (or RWC's here - RoadWorthy Certificate). NSW has a similar system to you, but is the only State that does.
Instead, we have to perform a very comprehensive RWC when vehicles change hands or have a lapsed registration (by more than 28 days) and are being re-registered.
At all other times the car must be maintained in a roadworthy condition on an owner onus basis which can be randomly checked by police.