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I installed EBC grooved and dimpled rotors and greenstuff pads on the front of my 99 9-3 SE this summer, and I've noticed that they fade considerably under semi-hard use (not at all during normal use) on the street. It is so noticable that Jak actually mentioned that it was abnormal when he was driving it. Also, at highway speed in rain, they take a noticably long amount of time to dry off before peddle pressure is effective. I started to think that maybe they were installed in reverse so that the grooves were actually trapping gases and forcing the pads away from the rotors when heated up. I began researching, and here's what I found:
1. Brembo and Baer recommend that the slots on the rotors attack the pads (outer part of slot contacts the pad first)
2. Brembo and Baer typically use vanes inside the rotor that are angled to better channel heat away
3. EBC rotors use straight vanes like OEM that are not angled
4. Brembo and Baer stress that it is IMPORTANT that slots attack the pad, and OPPOSE the internal vaning
5. EBC does not give installation instructions on their website, and does not even mention attacking or following anywhere on the website
6. From people's installation pictures, and almost equal number of people have them installed each way
Normally the general rule is, slots should oppose vanes. It is clear that EBC rotors are not similar to Brembo or Baer brakes because EBC uses stright vanes and grooves instead of slots. So standards don't apply in this case.
My question is... which way is correct? Could this be causing my problems? I've included a picture to simplify things. Mine are currently installed in "B" orientation.
posted by 156.143.7...
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