slotted and cross drilled rotors install-direction

[Thebeast]

I wanted to make a thread that would answer everyones questions on which way slotted and cross drilled rotors should be installed. Its a big question that really isnt answered in any thread clearly. So i figured i would answer it clearly for future people who are planning on upgrading
1. If the rotors are solid, meaning they are not vented, like our rear rotors, then the direction of the rotor does not matter.
2. If your rotors are vented, like our front rotors, the direction in which the slots rotate is important.
All of my information is from brembo themselves. My mechanic just installed a full brembo brake upgrade and in the box was a document that tells you about the different kinds of rotors and how they should be installed.
Heres two pictures to demonstrate and then i will tell you why they should be installed this why.
This authenticates the document.

The correct way to install the rotor


A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Orientating the disc in this manner creates a cintrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the discs ability to dissapate heat.
Basically, you want the end of the slot or the hole nearest to the outer edge of the rotor to make contact with the brake pad first.

Just based on looks, the rotors look better opposite from what this picture shows. But, if you bought the rotors for what they were meant to do, then follow exactly what the picture shows and you will get the full benefit of having cross drilled and slotted rotors.
Hope this help everyone

[bluegtp33]

Re: slotted and cross drilled rotors install-direction

hmmmm, seems everyone installed the backwards, but wouldnt you want the heat to escape and therefore flow to the outer edge?

[bluegtp33]

Re: slotted and cross drilled rotors install-direction

Just based on looks, the rotors look better opposite from what this picture shows. But, if you bought the rotors for what they were meant to do, then follow exactly what the picture shows and you will get the full benefit of having cross drilled and slotted rotors.
Hope this help everyone

actually not true. it doesnt depend on the slots, but the vents

Slotted rotors

As with the plain rotors discussed above, the internal vanes should lean toward the back of the car. The direction of the slots on the outside of the rotor do not dictate whether the rotor is a left or a right. For rotors with slots machined in the same direction as the internal cooling vanes, the slots should lean toward the back of the car. For rotors with slots machined in the opposite direction as the internal cooling vanes, the slots should lean toward the front of the car. Bottom line - don't use the slots to decide which side to mount the rotor. Pay attention to the internal cooling vanes.

For slotted rotors with straight internal cooling vanes, the direction of the slots is totally up to you and what you think looks best. In this case, there is no wrong answer.