Hi When i put my bike in my car i have to take at least the front wheel out. What do you use to stop any leaks,if the brake handel gets moved,etc. Cheers
However, if you're on friendly terms with you LBS, then ask if they have any spare blocks to put into the calipers to stop the pistons from closing in case the level accidently gets squeezed.
As said already, your biggest concern will be the brake lever squeezing and closing up your pads, making it hard to get your disc back between them when putting the wheel back on. Try to put a spacer between them and you'll be fine.