Loving all the car content on CE. Does yours have the dual motor? I remember a friend taking me for a spin in a P100D and fuck me it was quick. I lusted after one for ages afterwards.
RE brakes, they may be squeaking because the calipers are sticking. If you don't use the brakes often then the brake pistons can seize slightly. Easiest way to sort that is to find a safe bit of road and do a couple of emergency stops to exercise the braking system.
Another tip I learned was that if you need your calipers adjusted, it's a similar procedure between cars and bikes, but motorbike places tend to charge less. I haven't used this tip yet so I can't verify if it's true in my experience, but that's never stopped me posting useless trivia before.