i would recommend the slotted rotors based on my racing experience. cross drilled have been around for decades but they do weaken the rotor... probably not a issue on a street car but why take the risk? Race car rotors are replaced regularly so not an issue for them. Plus proper crossed drilled rotors(eg porsche) are designed for structural integrity unlike the stuff you see on the market for vehicles like ours.
If you have access to a mill, then slotted are very easy to make. The groove does not have to be very deep to let water/hot gases escape. The holes/grooves have a few functions.. to increase “bite” for the edge of the pad to grip and to also let out water in the rain and hot gasses created during very heavy braking. Those barriers reduce the coefficient of friction quite a bit. Crossed drilled rotors have an added benefit of reduced thermal and rotational mass… which have little effect on our SUV.
So if I were to do anything to my rotors it would be grooves because I would hate to step on the brakes and have a rotor go away… I think I would rather just put bigger brakes on the VX if I was concerned with my brake performance…. Our rotors just look too small in the 18"... Brembo anyone?
Reply With Quote