Thanks for that link Asawadude, I have made a copy and saved for when I next change pads/rotors (discs in the UK).

Don

I think there were confussions when you are purchasing the after market parts. I learned that the Brembo sells the blank rotors to the distributor, the blank one does not have directional due to the vane. After holes were drilled by distributor then they determine which direction should be.
Here is a picture of the vane looklike

My brake still smell burning after 1200 miles driving with new brake, It's only smell when I done some hard driving. Is it true these cross drill rotors get hot quicker than the plain one when hard driving apply more frequently?

Thanks for inputs

Yes. That may or may not be a factor in the burning smell, but they will overheat more quickly. There simply isn't the same mass there to absorb the energy. That matters more than the surface area added by drilling the holes. The good news is that after you have overheated them, they cool down more quickly as well.

not sure why people think crossed drilled are better than solid, i guess it must be for looks but for such a heavy car unless you go for the full big brake kit i wouldnt use cross drilled. your better off using a solid rotor and ungrade the pads IMO

Braking is turning kinetic energy into heat, which creates gases which need to be dissipated which is accomplished by the holes in drilled rotors.

Just ask the BMW/Mercedes/Ferrari/Lamborghini/SRT/SVT engineers who use them as stadard equipment on performance cars.

JV

But With Todays Pads There Are Less Gases So No Need For Crossed Drilled For Normal Street Use, A Sports Car Or Track Car Yes But Not A 2 Ton Suv. A 2 TON SUV IS NOT A PERFORMANCE CAR.

Less gas doesn't mean no gas and it seems to me your real problem is the application (on an SAV) as opposed to the performance differential in the rotors. Many where on the forums would disagree with your statement that the X5 is not a performance car, too. So would BMW.

People spend their $$ how they want to in the end. I have no complaints on my Brembo drilled rotors and with the OEM pads and calipers I've had better braking feel. They were cheaper than OEM solid rotors cause I got them wholesale.

JV

If Crossed Drilled Were Better Why Does The 4.8 Not Have Them? Even On My F355 I Have Solid Rotors. Iam Not Saying Dont Use Them Iam Saying Imo Its Not The Way To Go Unless You Opt For The Full Big Brake Kit Most People Use Them For Looks And Thats Fine But They Are Not Better Than Solid For Normal Street Use.

I Guess We'll Have To Agree To Disagree:)

Unless you've had solid rotors and switched to drilled or vice versa, how would you really know which one is better?

JV