Slotted brake rotors use slots carved into the flat metal surface
to move gas, heat and water away from the surface of the rotors.
You can think of the slots as irrigation ditches that move the unwanted materials safely out of the way.
Slotted brake rotors are popular with performance car drivers because the type of driving they
do puts a lot of stress on the rotors. As we mentioned on the previous page, drilled rotors have been weakened, which makes them prone to cracking around the holes, particularly when they've been repeatedly driven hard. Because they tend to be a little more durable than the drilled brake rotors, slotted brake rotors may be a better brake part choice for some performance car drivers.
Of course, slotted brake rotors aren't perfect, either. They tend to wear down brake pads very quickly. Because of this, the most common type of performance brake rotors found on production performance cars are of the drilled variety. While that type of construction is seen as too weak for racing applications, most everyday drivers should have no trouble with drilled rotors on their street cars and can save the slotted rotors for cars that are racetrack-bound.
So how much different are car and truck brake parts -- particularly car and truck brake rotors -- from motorcycle brake rotors? Read the next page to find out.