Saw these brakes at the LA Carshow and was wondering if anyone offers this type of slotting for our car?

 

Why? Is there a purpose/function?

 

Bling, baby, bling.

Hell, there's no purpose for any slotting or drilling in a modern brake system. But people do it anyway.

 

I would say yes and no to that. Sure, there is no need for the slots to expel brake gasses that can cause pad float, however, the slots can be useful for two things:
1 keeping the rotor a bit cooler, not much, though.
2 keeping the pad smooth. As the groove passes the pad, it helps smooth out any imperfections the pad may have.

As for drilling, they can definitively lower the temperature of the rotor, however you sacrifice structural integrity for this. I have seen pictures of people with cracked rotors because of crossdrilling.


EDIT:
P.S. I have heard that some of the more extreme racing pads still have exhaust gas issues and require slotting or drilling.

 

^ nope.

The only use slotting has is to increase bite while driving on the street. Modern pads don't outgas unless they were improperly bedded.

That said, I like slotted rotors for that reason... increased bite.

<=-- rice rice

 

How do slotted rotors increase bite?

 

Butt-dyno, I would guess. But I've never had any, so I could be wrong.

 

They can increase bite because you have an edge, actually several edges, that run across the pad with each revolution of the disc. Unlike a completely smooth surface, the pad will get "grabbed" a bit by each of the slots as it passes under it.

That being said, I'd much rather increase bite by using a proper compound. While OK for the street, I'd never recommend a slotted (or even worse a drilled) rotor for the track.

 

More than anything, it's a perception thing. Since they have sharp edges, it takes less pedal pressure to start slowing down, so you get increased bite. Incidentally, drilled rotors do the same thing except with a slightly more dramatic effect... but I am not a fan of my rotors cracking.

 

Drilled rotors are utterly pointless, but they're popular for most "street machines." They apparently look bling bling and while they can afford the same advantages of a traditional slotted type rotor, the losses in structural integrity make them a no-no in my book.

Slotted rotors do indeed increase initial bite, but they can also assist in cooling and keeping dirt off the rotor, if the slot extends to the outer edge of the rotor. I don't really see the point in the triple non radiused slots in the first pic. That said, my front rotors are J-hooked (AP Racing).