so i've searched through years of threads and could never really find a clear answer.
Are the OEM brembo rotors directional? the ones my car came with has holes that face different ways on each wheel which looks kind of off.
I recently needed new front rotors and everywhere i look there is just one single part number. So i ordered a set of front rotors, but the shop i go to told me that both are a driver side front rotor?
wouldn't they be exactly the same and it not matter?
from reading it seems the way the veins are straight so any direction is fine.

thanks

 

You're right there's only one part number for the fronts and one part number for the rear. That means Brembo/Lexus didn't care which way the holes pointed. When installed on the car, the right rotor's hole pattern will "point" towards the front of the car while the left one's will point to the rear (just like you said in your post). https://www.bremboparts.com/europe/e...20/000024545-1

The holes on our front and rear rotors "claw" clockwise when looking at them with the hat facing you. Like this:

That image was taken from the brembo website.


Please don't let these next images confuse you:
This one copies the images from the brembo website and pastes reversed copies next to the originals. That makes them appear to be directional:


This image for some reason is a reverse image with the hat facing us. Notice the brembo label is backwards:

It also doesn't help that, on Lexus parts websites like mylparts, the left and right rotors can each be ordered separately but they share the same part number.

 

i saw these pictures too. hmm, i wonder why the mechanic said they were wrong?
is their any reason not to but them on backwards looking?

 

Your mechanic could just be mistaken. I recall my is350 had L and R specific rotors. Seeing as our brembos have just one part number, I wouldn't worry. Having the fins inside the rotor face the wrong way just means the rotors won't be cooled as effectively but again, not the case with our oem rotors.

 

F-Sport 2pc rotors have separate part numbers for each corner, meaning the internal vanes are directional L/R. As we have two part numbers total between front and rear I doubt we have directional vanes.

 

This was discussed years ago. The direction of the holes is entirely inconsequential. The internal shape of the vanes is what makes a rotor directional, and our vanes are as conventional as you can get.

And the holes do nothing to add cooling. That's a myth not supported by measurement in the field, especially when the holes rapidly clog with brake pad material in track use where you need the MOST cooling possible.

 

You sure you remember the isf? Haha. Thanks for the info bud. So I should just go ahead and have them mounted?

 

He remembers EVERYTHING