The noise could be from the electric motors themselves or in the gears and cogs that physically move the mirrors to their new positions. Pulling the mirror apart and lubricating these mechanisms might help reduce the noise and may even fix the one mirror’s reluctance to move through its full range of positions.

As far as warranty goes, the situation is a bit complicated in that the dealer may examine the noise and decide that it’s not abnormal. But what you should do before the warranty runs out is have the car examined and the problem logged at dealership level. That way, if anything goes wrong as a result of the problem, even if it’s beyond the warranty period, you have what’s called a pre-existing condition whereby the problems is Subaru’s to fix because it existed while the warranty was still current, even if it wasn’t fixed at that time. The point being that the dealer can’t delay a fix reported during the warranty period and then claim that the vehicle is out of warranty and refuse to fix the problem.

A car can stop in its tracks for hundreds of reasons, but in a car like yours, first suspicions would be either the fuel pump or something like the crank-angle sensor. If the problem had been a clogged fuel filter or a dud spark plug, the problem would probably have made the engine run poorly, but not stopped it dead in an instant.

Electric fuel pumps don’t last forever and, when they die, they die quickly and without notice. Same goes for crank-angle sensors, without which, the computer doesn’t know where the individual pistons are in each cylinder and, therefore, can’t inject fuel or create spark at the precise time it needs to.

Any time the brakes (or any other system of a car) start to feel different than they have done since you bought the car, there’s probably something wrong. If it was an older car, I’d suggest a brake fluid change as the first step, but that’s unlikely to be the reason in an almost-new car. The problem sounds like there’s air in the braking system (there should only be brake fluid, and no air) but, again, that’s a wild card in such a new vehicle.

In any case, you’re doing the right thing by having the car independently tested. If the results come back suggesting a problem, you have good ammunition to get the dealership to fix this as a warranty matter. Make sure you get a written report from the mechanic detailing the braking system’s performance, and don’t be afraid to go over the dealer’s head to Subaru Australia’s customer service department.