drilled and slotted rotors for 78 malibu

I have 1 small crack on the inside of one my front Baer rotors (they're slotted & crossdrilled) my car is street only (so far) but my brake usage is definitely not covered under most people's definition of 'normal wear and tear' (i.e. beating on the brakes prior to getting a little heat in them, or abusing them and then immediatly parking the car which causes uneven cooling as one part of the rotor sits in the pads/caliper) then you can crack a rotor from street use. If the car sees severe/hard street duty or especially improper hard use (i.e.

Solid rotors can heat check & crack too, but it takes longer for them to do so than crossdrilled.Īll that being said, I have yet to see a crossdrilled rotor on a STREET car that sees 'sane' usage develop cracks. Granted all the cracked crossdrilled rotors I have picked up were off track cars but even casual weekend track cars suffer from it eventually. I've seen more cracked crossdrilled rotors than I care to count, some to the point I'm amazed the car made it off the track safely. You are paying extra to lose additional rotor surface area for the pad to clamp against and also paying extra for more places where a crack can start.Ĭrossdrilling does almost nothing for cooling (the airpath on a directionally vented rotor is from the hub out through the vanes around the circumference, not through the holes) and the holes only serve as crack propagation points. As has been said, slotted is OK but not really necessary given modern pad compounds and X-drilled isn't worth paying extra for.

Drilled and slotted rotors for 78 malibu