drilled/slotted rotors

[cali yaris]

If slotting and drilling doesn't help to dissipate heat, why do track cars have slotted and drilled rotors? It cannot be for the look.

I agree that there is not additional stopping power, but I think you're wrong about brake fade and heat dissipation.

[bearda]

I haven't seen a real track car yet that had drilled rotors (not recently, at least). I've seen a lot of Porsches that had ventilated rotors, but the holes were cast in so the rotor didn't weaken as much. Porsche claims they cast holes into their rotors only to dissipate steam in wet-braking conditions. The only other reason to drill or ventilate rotors would be to remove weight, but by the time you got any significant savings you would have compromised your braking and rotor integrity too much to be worthwhile.

Rotors are slotted to remove debris from the pad surface. Brake dust, dirt, road debris, etc. I've heard a lot of people claim it increases pad "bite", but most of the time it was the same people claiming drilling rotors made you stop faster....

[largeorangefont]

Originally Posted by cali yaris

If slotting and drilling doesn't help to dissipate heat, why do track cars have slotted and drilled rotors? It cannot be for the look.

I agree that there is not additional stopping power, but I think you're wrong about brake fade and heat dissipation.

Well since your Yaris is a track car, go ahead and add them.

You think full race cars run cast iron rotors and street pads? No they run carbon or ceramic rotors and exotic pads for said rotors. When your rotors are glowing like in my avatar maybe you consider drilling.

Like I said, On a street car with agressive street pads, slotted and drilled rotors are USELESS. They look cool but you won't see any differences. The money is better spent on better pads, fluid and SS lines.