Upgrading to 2-piece rotors is a popular choice for Mitsubishi EVO owners who want improved braking performance, reduced unsprung weight, and better heat management. But to get the most out of your new rotors, correct installation is critical. One of the most common mistakes is fitting them on the wrong side of the car, which can lead to overheating, reduced cooling efficiency, and even premature rotor failure.
Here’s a simple guide to ensure you fit your rotors correctly every time:
1. Locate the Rotational Arrow
Most 2-piece performance rotors come with a rotational arrow etched or engraved on the outer edge or hat section. This arrow shows the direction the rotor must turn when the car is moving forward.
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Left-hand side (driver’s side in AU/JDM) → Arrow should point forward in the direction of wheel rotation.
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Right-hand side (passenger side) → Arrow should also point forward in the direction of rotation.
If your rotor has this marking, simply align it with the forward wheel movement and you’re good to go.
2. No Arrow? Check the Cooling Vane Design
Not all rotors have arrows stamped on them, especially some aftermarket or track-focused designs. In this case, you need to look closely at the internal cooling vanes or air vents.
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Performance rotors are usually designed with curved or directional vanes that scoop air as the rotor spins.
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The vanes should act like a fan: pulling cool air from the hub and pumping it outward through the disc as the wheel rotates forward.
How to Identify Correct Rotation:
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Look at the vane angle:
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If they lean backward relative to rotation, you’ve got it wrong.
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If they lean forward, scooping air as the wheel turns, that’s correct.
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This airflow effect is what keeps rotor temperatures under control, especially under hard braking.
Why It Matters
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Correct airflow = maximum cooling efficiency
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Reduced brake fade during repeated hard stops
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Extended rotor life thanks to better heat management
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Consistent braking performance on street and track
Installing 2-piece rotors the wrong way might not be immediately noticeable, but over time, poor cooling can warp rotors, cook brake pads, and even damage calipers.
Final Tip
Whenever possible, follow the manufacturer’s fitting instructions. If in doubt, rely on the vane direction to confirm correct rotation. A few extra minutes during installation can save you from costly brake issues later.
🔧 In summary:
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Always check for a rotational arrow first.
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No arrow? Use the cooling vane direction — they must scoop air as the rotor turns forward.
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Correct fitment means stronger, more reliable braking for your EVO