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Old 08-17-2020, 05:36 PM   #1
motoxnate
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Member#: 486963
Join Date: Jun 2018
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2004 WRX
Black

Default Slotted Rotor Direction Advice

Hi guys, this is so dumb and I'm annoyed I have to ask this question.

I have an '04 WRX with the FHI brake upgrade. When I got the car the previous owner had put the front brakes on but not the rears because he bought the wrong parts. I now have all the right parts and I'm trying to put the rear brakes on.

I have slotted and drilled rotors going on, and the ones in the front (that he put on) have the slots drifting backwards like this.

And the new rotors I have (the same ones) are labeled L and R opposite of that, with the slots facing forward like this.

Would it cause an issue if I swapped the front brakes to the right direction since they are worn in going the other way? Or vice versa, will I lose a lot of performance by putting the rears on incorrectly so they match the front?

Thanks for any advice
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Old 08-18-2020, 07:27 AM   #2
Norm Peterson
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Join Date: Mar 2019
Chapter/Region: Tri-State
Location: our wrx IS the family sedan
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'19 WRX Ltd 6M dgm
'08 Mustang GT (the toy)

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Quote:
Originally Posted by motoxnate View Post
I have slotted and drilled rotors going on, and the ones in the front (that he put on) have the slots drifting backwards like this.
Sorry, not gonna listen all that yelling into the camera. Can you take a picture of your own car?

What I can tell you is that it's the direction of the vanes inside a vented rotor that determines the rotation direction/side of the car it goes on, not the direction of the slots. Curved or angled vanes may well be aimed opposite to the slots. Do what your rotor mfr told you to do.

It would probably be worth pulling the front discs to make sure they were installed on the correct sides, though you might be in for a bit of work and some expense if they're on the wrong sides.


Norm
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Old 08-18-2020, 09:01 AM   #3
motoxnate
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2004 WRX
Black

Default

Thanks norm, sorry I didn’t mean to post a video link, I copied a link of the image but I guess it posted a video by accident.

The vanes inside the rotors are not angled at all, just radial. I’m thinking because of this the slots on my rotors are probably more for looks than actual performance.
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Old 08-18-2020, 09:17 AM   #4
Norm Peterson
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Location: our wrx IS the family sedan
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'19 WRX Ltd 6M dgm
'08 Mustang GT (the toy)

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Slots on rotors for street-driven cars are more functional for something other than pad outgassing (which has become a non-issue any more). What they do is provide better places for little bits of sand and other grit to drop off into than getting embedded in the pads and making noise and scoring the rotor faces. There may be some advantage in wet weather as well.

I have no idea what the PO had in mind, and I generally avoid getting involved in the appearance side of most topics.


Norm
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Old 08-18-2020, 09:50 AM   #5
Samurai Jack
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Typically, the slots face forward.

Quote:
Originally Posted by Norm Peterson
Sorry, not gonna listen all that yelling into the camera.
Agreed. What is it it all about anyway with these kids yelling in the camera?
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