Rear rotor size

X5Buell · 08-26-2021, 10:38 AM

I recently did the rear brakes , just pads as they were badly worn. Thought at 50KM the rotors would be fine. But I’m not happy as there is a slight pedal pulsation
So. Ordering rotors and there seems to be a dozen different sizes
300mm
320mm
385mm
340mm
As soon as I say MSport I think it throws the sales guy off and I’m thinking he is looking at “M” brakes. Thank you
Any help on this would be great
It is a 2018 X5 35d with M sport

RED_Y_ · 08-26-2021, 10:54 AM

If you don't have M-performance brake kit and you did not do any brake retrofits it is just standard 320X20 for rear. Nothing special.
I run these rotors:
https://www.ecstuning.com/b-ecs-part...176ecs04aktkt/

X5Buell · 08-26-2021, 10:56 AM

Great. I figured but didn’t want them shipped and have to send back. Are you happy with those rotors? I assume they are fully coated

RED_Y_ · 08-26-2021, 11:10 AM

Yes, I got ECS rotors front and rear, 0 rust, look like new and I have them for over 2 years now.

X5Buell · 09-07-2021, 05:37 PM

Quote:

Originally Posted by RED_Y_

If you don't have M-performance brake kit and you did not do any brake retrofits it is just standard 320X20 for rear. Nothing special.
I run these rotors:
https://www.ecstuning.com/b-ecs-part...176ecs04aktkt/

How do you find them after some use? Do the holes get plugged at all

RED_Y_ · 09-07-2021, 06:37 PM

Quote:

Originally Posted by X5Buell

How do you find them after some use? Do the holes get plugged at all

Nothing gets stuck in the holes, no rust, still look brand new.

X5Buell · 09-07-2021, 10:59 PM

And no warping yet?

RED_Y_ · 09-08-2021, 10:28 AM

Quote:

Originally Posted by X5Buell

And no warping yet?

Nope.

M302_imola · 09-08-2021, 12:57 PM

Quote:

Originally Posted by RED_Y_

If you don't have M-performance brake kit and you did not do any brake retrofits it is just standard 320X20 for rear. Nothing special.
I run these rotors:
https://www.ecstuning.com/b-ecs-part...176ecs04aktkt/

I might have asked you before but what pads are you running w/ these rotors?

RED_Y_ · 09-08-2021, 01:29 PM

Quote:

Originally Posted by M302_imola

I might have asked you before but what pads are you running w/ these rotors?

You did, Akebono Euro Ceramic pads, got them from TireRack.

This set

PeeBeeJammin · 09-26-2023, 04:48 PM

For anyone else looking for M Performance brake information, realoem.com has a separate section with related parts.
For this one see https://www.realoem.com/bmw/enUS/sho...diagId=03_0119
Hope this helps any future readers.
I have a 2014 x5 xdrive50i with "S337 M Sports Package" which has the 395mm front and 385mm rear rotors. See www.mdecoder.com for your VIN info.
https://www.instagram.com/p/Cxq6-0qPh7N/

08-26-2021, 10:38 AM	#1
X5Buell Private 27 Rep 93 Posts Drives: 2018 BMW X5 35D M sport Join Date: Aug 2020 Location: Maple Ridge iTrader: (0)	Rear rotor size I recently did the rear brakes , just pads as they were badly worn. Thought at 50KM the rotors would be fine. But I’m not happy as there is a slight pedal pulsation So. Ordering rotors and there seems to be a dozen different sizes 300mm 320mm 385mm 340mm As soon as I say MSport I think it throws the sales guy off and I’m thinking he is looking at “M” brakes. Thank you Any help on this would be great It is a 2018 X5 35d with M sport
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08-26-2021, 10:54 AM	#2
RED_Y_ Colonel 1060 Rep 2,513 Posts Drives: 2014 X5 3.5d Join Date: Sep 2017 Location: SF Bay Area iTrader: (0)	If you don't have M-performance brake kit and you did not do any brake retrofits it is just standard 320X20 for rear. Nothing special. I run these rotors: https://www.ecstuning.com/b-ecs-part...176ecs04aktkt/
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08-26-2021, 10:56 AM	#3
X5Buell Private 27 Rep 93 Posts Drives: 2018 BMW X5 35D M sport Join Date: Aug 2020 Location: Maple Ridge iTrader: (0)	Great. I figured but didn’t want them shipped and have to send back. Are you happy with those rotors? I assume they are fully coated
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08-26-2021, 11:10 AM	#4
RED_Y_ Colonel 1060 Rep 2,513 Posts Drives: 2014 X5 3.5d Join Date: Sep 2017 Location: SF Bay Area iTrader: (0)	Yes, I got ECS rotors front and rear, 0 rust, look like new and I have them for over 2 years now.
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09-07-2021, 10:59 PM	#7
X5Buell Private 27 Rep 93 Posts Drives: 2018 BMW X5 35D M sport Join Date: Aug 2020 Location: Maple Ridge iTrader: (0)	And no warping yet?
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Rear rotor size

09-26-2023, 04:48 PM	#11
PeeBeeJammin Registered 0 Rep 1 Posts Drives: 2014 BMW X5 Xdrive50i Join Date: Sep 2023 Location: Calgary, AB iTrader: (0)	M Sport brake rotor sizes For anyone else looking for M Performance brake information, realoem.com has a separate section with related parts. For this one see https://www.realoem.com/bmw/enUS/sho...diagId=03_0119 Hope this helps any future readers. I have a 2014 x5 xdrive50i with "S337 M Sports Package" which has the 395mm front and 385mm rear rotors. See www.mdecoder.com for your VIN info. https://www.instagram.com/p/Cxq6-0qPh7N/
	Appreciate 0 Quote