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Old 08-27-2009, 08:00 AM   #1
FuriousG
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Slotted rotors direction?

I bought a set of drilled/slotted rotors from Autozone (Baer Decela rotors) and put them on my car about a month ago. Each of the rotors had a little sticker on them that indicated whether they were 'L' or 'R'. This may be a stupid question but which direction are they judging that from? Is that from the driver's seat facing the front of the car or from the front bumper facing the back of the car?

Right now they are on as if I was in the driver's seat but it looks backwards to me. Sure, they stop the car just fine but sometimes I get a bit of a stutter (similar to ABS) when I slow down from high speeds. I'm wondering if that 's because they are on backwards or not. I can easily change them around but I figured I'd ask the potentially stupid question before I waste my time. Are the slots supposed to go with the forward rotation of the tires or against them? I've seen a couple Mustangs on base with slotted rotors and they all go with the rotation so I'm starting to think I got it backwards. Any thoughts???
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Old 08-27-2009, 08:17 AM   #2
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These rotors are on backwards. That is the front passenger side in the picture. The veins (slots) should be going through the caliper the other way.

Like this:

\
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Old 08-27-2009, 08:20 AM   #3
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^^^Are you sure? I was just about to post that mine go the other way. I will look at lunch time to see how mine are mounted. BTW, the markings are for you sitting in the drivers seat.
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Old 08-27-2009, 08:30 AM   #4
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Sorry, I just checked. KhellendrosxS IS correct. Disregard my ^^^ ignorant post.
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Old 08-27-2009, 08:42 AM   #5
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Looks as though mine are on backwards then... Strangely enough, that's how they were marked though. The driver's side had the "L" sticker on it and the passenger's side had the "R" sticker. Looks like someone put the wrong stickers on before they got packaged up.
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Old 08-27-2009, 09:30 AM   #6
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That's not always true. My Baer Decela's are reverse rotation. Mine are just like in that picture, I've had mine for a year with 0 issues of wear or vibrations.
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Old 08-27-2009, 11:20 AM   #7
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When they mark them left/right, they mean if you are in the drivers seat looking forward. The drivers side of the car is left, passenger side is right.

Some brands of rotors are designed to have the slot on the face angled backward and a few have them facing forwards. That doesn't really matter much as they just sweep across the face of the pad. What is important is the direction of the cooling vanes in the center of the rotor. They should be angle towards the back of the car, so that as the car moves forward and the wheels turn, the rotors suck air in through the center hub area and push it towards the outside of the rotor. If the cooling vanes aren't angled but rather straight, then it doesn't matter which side they go on, and they can go on either side or whatever left/right they are marked from the manufacturer if they are slotted.
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Old 08-27-2009, 11:51 AM   #8
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Quote:
Originally Posted by [ChaosweaveR] View Post
That's not always true. My Baer Decela's are reverse rotation. Mine are just like in that picture, I've had mine for a year with 0 issues of wear or vibrations.
Well, since I have the same ones, I'm now changing my mind again to believe that they are correct since that's how they were marked. It did seem a little unlikely to me that both the front and rear sets I bought would be marked incorrectly. I'm glad I decided to wait for some more input before I started swapping rotors around...

Now I just have to figure out if that slight ABS-like shimmy is just normal feeling for these brakes (I have the Duralast Golds from Autozone) or if I have something slightly off that's causing the vibration.
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Old 08-27-2009, 07:15 PM   #9
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If they are marked L and R, then the L goes on the driver's side and the R on the passenger side.
Like Aaron said, the dirtection of the slots has no bearing whatsoever on the rotation direction of the rotor....it the cooling vanes (on the inside of the rotor) that are important. If your slotted rotors had straight cooling vanes, it would not matter which side you installed them in......but since the Baer rotors have directional cooling vanes you need to take care to install them in the correct locations.
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Old 08-29-2009, 08:56 AM   #10
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Quote:
Originally Posted by KhellendrosxS View Post


These rotors are on backwards. That is the front passenger side in the picture. The veins (slots) should be going through the caliper the other way.

Like this:
Hey hey my brakes work fine
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