# W/ M Sport Brake

**URL:** <https://community.cartalk.com/t/w-m-sport-brake/181029>\
**Category:** Maintenance/Repairs\
**Tags:** x3, bmw\
**Created:** [December 2, 2021, 5:56pm UTC](https://community.cartalk.com/t/w-m-sport-brake/181029 "2021-12-02T17:56:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![riaanshweta\_175004](https://avatars.discourse-cdn.com/v4/letter/r/dc4da7/32.png) [@riaanshweta\_175004](https://community.cartalk.com/u/riaanshweta_175004)\
**Post date:** [December 2, 2021, 5:56pm UTC](https://community.cartalk.com/t/w-m-sport-brake/181029/1 "2021-12-02T17:56:37Z")

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Hi,

I need to replace the brakes and rotors for my BMW.

I am able to find right rotor except M sport brake which is cheaper. But the left rotor is only available w/M sport brake which is $70 more expensive.

Is it okay to mix and match , that is buy one rotor with M sport brake and the other without it.

Thanks!

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [December 2, 2021, 6:10pm UTC](https://community.cartalk.com/t/w-m-sport-brake/181029/2 "2021-12-02T18:10:12Z")

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> [@riaanshweta\_175004](#):
>
> Is it okay to mix and match , that is buy one rotor with M sport brake and the other without it.

Probably not. But you didn’t tell me enough about your X3 to give you a more definitive answer.

They might not be the same diameter and thickness. M-sport brakes are usually larger than the basic model.

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [December 2, 2021, 6:13pm UTC](https://community.cartalk.com/t/w-m-sport-brake/181029/3 "2021-12-02T18:13:28Z")

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I’d never mix and match.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [December 2, 2021, 6:16pm UTC](https://community.cartalk.com/t/w-m-sport-brake/181029/4 "2021-12-02T18:16:13Z")

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M Sport brake rotors are larger in diameter.

![image](https://global.discourse-cdn.com/cartalk/original/3X/3/9/395b333a2e027d310da75e6e99c87fe44773cd4b.png)

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [December 3, 2021, 12:26am UTC](https://community.cartalk.com/t/w-m-sport-brake/181029/5 "2021-12-03T00:26:57Z")

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IMO the same spec rotor needs to be on both sides of the same axle. One thing BMW’s have is excellent brakes, suggest don’t mess with the basic design.