Slotted vs. drilled

[330i ZHP]

I will mention that the Brembo BBK 380mm that were crossdrilled warped - an awful shudder when braking

[Vas]

Stasis states that "Crescent slots provide gas relief and pad cleaning while minimizing the pedal pulsations normally associated with straight-slotted rotors or cracking issues common with cross-drilled rotors."

[sketchyd]

Sounds good to me. Personally I like the look of slotted better anyway.

Tapped on a talk device

[az3579]

Stasis states that "Crescent slots provide gas relief and pad cleaning while minimizing the pedal pulsations normally associated with straight-slotted rotors or cracking issues common with cross-drilled rotors."

What is this "pulsations"? I can't say I know what this person means by that.
If it's in regards to vibrations, I didn't have any issues with vibrations or "pulating" until my rotors got well below minimum spec (like they are now). Mine are slotted.

[Vas]

Pedal pulsation is when pads get overheated and the overheated pad is pressed against the rotor. Brake pad material is transferred into the rotor at the molecular level, and then there's a spot with different thermal expansion than the rest of the rotor.

Often mistake for warped rotors.

[M0nk3y]

Pedal pulsation is when pads get overheated and the overheated pad is pressed against the rotor. Brake pad material is transferred into the rotor at the molecular level, and then there's a spot with different thermal expansion than the rest of the rotor.

Often mistake for warped rotors.

BINGO.

Can I vote for blank rotors?

I have drilled by OEM, and personally they are garbage. The drilled holes are always clogged with dust either from track days or autocross. I dont remember when they were replaced, but after 10k miles hard driven (most of the time) they need replaced

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[Vas]

Blanks are the way too go.

[danewilson77]

Blanks are the way too go.

Unless you daily drive and like the aesthetics of the BMW Performance cross drilled rotors.

Sent from my Samsung Galaxy S4

[Vas]

Good point Dane. Plus those rotors are a 2 piece design so less rotational mass. However pad life is reduced with them.

[az3579]

Pedal pulsation is when pads get overheated and the overheated pad is pressed against the rotor. Brake pad material is transferred into the rotor at the molecular level, and then there's a spot with different thermal expansion than the rest of the rotor.

Often mistake for warped rotors.

Ah, the very thing I avoid doing at all costs coming off a track session. Didn't realize that had a name. lol
Thanks.

Unless you daily drive and like the aesthetics of the BMW Performance cross drilled rotors.

Sent from my Samsung Galaxy S4

Might I add that they are semi-floating and cast drilled, not cross drilled.