ModifiedA4

for non directionally vaned rotors, the slot should sweep foreward.

this <a href="http://www.brakewarehouse.com/brkewrhsefaqs.htm">article</a> mentions the brembo slotted brake requirement:
<i>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.</i>

this <a href="http://www.baer.com/support/TechTips.aspx?TechTipID=2">link</a> explains one reason why:
<i>Externally modified Baer rotors employ a REVERSE SLOT or a REVERSE SLOT &amp; DRILL pattern. This is current racecar practice and lowers the potential for "carbon smearing" or "transfer" from the pad material to the trailing side of the slots on the rotor. This is important because in some cases this "smearing" actually affects the rotational balance of the rotor and can cause a "shake" or "nibble" while braking.</i>
<img src="http://www.baer.com/support/Images/Rotor2.jpg"><img src="http://www.baer.com/support/Images/Rotor1.jpg">

discuss.

RKA

Everybody with smearing problems, please raise your hand.

ModifiedA4

lol!

ThirdEye

oops

Sal R.

<center><img src="http://pictureposter.audiworld.com/12957/smear_004.jpg"></center><p>

Justin517

wich i read afterwords and realized they were the wrong way, oh well no problems here.