Just an fyi- drilled / slotted rotors:
The drilled holes are to allow more air flow across the face and have more cooling. The concentrated areas tend to create more rotor warping when used at moderate braking levels- works well high speed and frequent hard braking. Not so much getting groceries.
The slot is designed to do a micro shave of the pads every time the brakes are applied. It is a pure performance useage where you are knowingly sacrificing the longevity of the pad to keep the pad from glazing over so you will have slightly better braking under high heat applications. This would be exactly opposite of wanting long life from them.
The advantage to both of these is sacrifice the pad life and even rotor life for performance.
most people just copy what the performance world does because it’s “better”, but don’t understand the pro/con.
Doing offroad, especially fine dust or mud greatly shortens the life beyond that because the particles build up in the holes and slots. Simply adding sandpaper to run across the pads from dirt/mud in the holes. Dirt will embed in the pads, Then the slot does it designed job and shaves away some pad material to eliminate the high spot of the dirt.
In the harsh desert races like Mint400, baja 500&1000- it is not uncommon to eat 80% of a set of pads each race. But going that fast who cares about a stupid $400 set of pads on each axle. Go fast or go home.
If he is generating that much heat to justify drilled AND slotted rotors- ya might send those rotors for thermal heat dispersion coating then chryo so they last and only wear the pads faster instead of the rotors having short life also. DD drilled & slotted rotors
Is far more common in Hummers- because braking isn’t exactly stellar. So adding brembos or similar happens as well. Better calipers make much bigger improvements than rotor does by 3:1.
