Slotted rotors...which way do they go?
 

Okay, this might be a really dumb question. None the less, it's one that hasn't been asked or answered here. I searched.

I have a set of slotted rotors I picked up cheap a couple months ago. I was *thinking* about installing them this weekend if I don't go wheeling with a couple other members here. Which way should the slots point? Pointing towards the front or rear?

say your truck is facing that way <--------- the slots should go /
hope that helps

That helps. Thank you!

EDIT 2: After some research and other opinions I have changed the picture.
I think this is what he's saying:
http://www.drwastaken.com/temp/rotor.gif

Edit: I guess I was too late.

are they even directional? i dont think it matters, the slots are more for heat dissipation than anything else.

lee

They do also wipe the pads of dust accumulation.
This is why the slots are directional....ie they should wipe from the inside out as was pictured above.

***Threadjack****
How would slotted handle muddy condtions? Wouldnt the mud just clog up the slots?

Here pictures worth a 1000 words.. These are my cross drilled ones but slots go the same direction (Driver side)
http://community.webshots.com/photo/...69409835qCJewR

Greetings,
From the Brembo Brake Forum:
Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are three vane types in use:

* Straight
* Pillar vane (comprised of many small posts)
* Curved vane

The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Please see figure. Orienting the disc in the manner creates a centrifugal 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 disc's ability to dissipate heat.

Additionally, all of Brembo's slotted discs are directional as well, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first. Please see figure.

http://www.buybrakes.com/brembo/faq.html#q28

This is correct, as in *front*<---\
I run slotted rotors on all 4 corners of my Impala SS and this is the way they go.


This is incorrect.

I've changed the picture, so now the above picture IS correct.

What's that light brown stuff?

Thats just the protective coating they put on it ... If thats what your refering too

They as in who made the rotors? Looks exactly like primer from Sears hardware that I always spray on new rotors. Same exact color! :hillbill:

Slotted rotors are not for cooling. The slots are to remove surface glazing from overheating as well as gas venting during braking. The gas that vents is from the vaporization of the bonding agents that hold the pad material together. For these things to occur, it takes sustained high temperatures. You'd have to heat your pads up to the point they fade and then continue to use them. How many of us encounter those kinds of conditions?

Btw, I'm not saying don't get slotted rotors, they look cool and stuff but let's not kid ourselves about 'needing' performance rotors on our 4runners.

If they are to remove surface glazing from overheating. Isnt this technicallly cooling? I think that if you drive your 4runner an normal speed, don't load a lot of weight in it, and never tow anything then you probably don't need performance rotors. for everybody else, which is a lot of people on this forum slotted rotors will help.

Alan if you need a hand with that, I have nothing to do tomorrow. wheeling is not looking very likely. Or ill just well crap together around the house with my new toy. ;)

OPS my bad :chair:
http://www.wheelersoffroad.com/4runnerbrakes.htm
Powerstop brand, I got mine from the link a while ago