Which brakes do I really have?

kosmokratur · 06-21-2022, 05:53 PM

I seems inordinately confusing to figure out part numbers for M550 brakes... if I were paranoid, I might think it is deliberate.

I have a 2018 M550, VIN B036199. A retailer that sells OEM rotors just told me that mine are 370x24, PN 34206896674. However, RealOEM tells me that I have a 374x36 rotor, 34116875283 and '284.

This CPO car has about 54K miles and does not need rotors yet, but I want to have a set on hand for when it does. Any suggestions for how to tell what I really have? I have done no mods and the calipers are blue. Thanks!

540iSUP · 06-22-2022, 09:53 AM

I can tell you for sure your front rotors are 374. The rear rotors on the G30 changed for LCI. Post LCI has 370 rear rotors, pre-LCI has the 345 rotors.

540iSUP · 06-25-2022, 04:46 AM

I wanted to add that if you want to know for sure what you have, the specs will be engraved or printed on the back side of the rotor, facing the hub.

06-21-2022, 05:53 PM	#1
kosmokratur Second Lieutenant 142 Rep 252 Posts Drives: 2018 M550, '00 750, '97 540,.. Join Date: Aug 2019 Location: Finger Lakes, NY iTrader: (0)	Which brakes do I really have? I seems inordinately confusing to figure out part numbers for M550 brakes... if I were paranoid, I might think it is deliberate. I have a 2018 M550, VIN B036199. A retailer that sells OEM rotors just told me that mine are 370x24, PN 34206896674. However, RealOEM tells me that I have a 374x36 rotor, 34116875283 and '284. This CPO car has about 54K miles and does not need rotors yet, but I want to have a set on hand for when it does. Any suggestions for how to tell what I really have? I have done no mods and the calipers are blue. Thanks!
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06-22-2022, 09:53 AM	#2
540iSUP Captain 704 Rep 803 Posts Drives: G30, E36 Join Date: Apr 2021 Location: California iTrader: (1)	I can tell you for sure your front rotors are 374. The rear rotors on the G30 changed for LCI. Post LCI has 370 rear rotors, pre-LCI has the 345 rotors.
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06-25-2022, 04:46 AM	#3
540iSUP Captain 704 Rep 803 Posts Drives: G30, E36 Join Date: Apr 2021 Location: California iTrader: (1)	I wanted to add that if you want to know for sure what you have, the specs will be engraved or printed on the back side of the rotor, facing the hub.
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