Originally Posted by MajorTom
It may be different for most cars, but I think you usually have to give about 3.5 to 4 inches of clearance for brakes. Using that formula, the brembos with 14 inch front and 14.4 inch rear rotors just might fit the 18 inch wheels.
This is all just from observation. I've seen exceptions to this rule, but not all the time.
You are forgetting the added height of the calipers.