Q: How does this rear kit add braking without changing my Model X calipers?
It uses a wider annulus rotor and a matched larger pad to grow the contact patch inside the factory caliper. The sweep goes from the factory 47mm to 55mm, so you get more pad-to-rotor surface and more thermal mass without relocating anything. Clever packaging is the whole point of this design.
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For the do it yourselfer or trained mechanic, our in-depth installation guides provide step by step detailed instructions on fitting your Tesla with Unplugged Performance Parts.
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