[Midwaymonsters]

I have a 2013 BMW 535i that I recently bought from a private owner who provided me with maintenance paperwork. When I took it in the other day to get an oil change, a BMW super/manager said that the front rotors are the same size as the rear rotors; therefore, being too small. I looked through the paperwork and found that they had installed new rotors in June 2020. I showed him the paperwork and he assured me that they had installed the correct rotors. Later, after I got home and looked at the part numbers, I noticed that the front and rear rotors have different part numbers (Front: 34-11-6-884-301; Rear: 34-21-6-775-287). Are both the rear and front rotors supposed to be the same? Does any one know by looking at the part number if the front rotors are in fact too small? There is no other rotor replacement service anywhere in the paperwork that I've noticed. Is he yankin' my chain, I hope not. TIA!

[Conserve]

Front rotors are 348x30
rear rotors are 330x20
I am thinking whomever installed them before got the front & rear rotors mixed up. easy way to confirm will be to take one wheel off front & rear and measure thickness.

[Midwaymonsters]

Thanks for the information/photos, Conserve!! I'm going to call the 2 shops that the previous owner had taken the car to for tire/brake service to see if they have any information regarding the front rotors. The paperwork I have does not indicate that the rotors had ever been replaced since BMW had put new ones on in 2020. It does seem strange that BMW would accidentally put the incorrect size on the car, but mistakes do happen and that's what I'm trying to find out. Would the rotors have any numbers engraved in them to identify them?

[Conserve]

I don't think rotors have part# stamped or embossed in them as part of casting. Easiest way would to confirm 100% is taking two wheels off yourself and check rotor thicknesses. Can you post pic of that paperwork.

[Midwaymonsters]

Originally Posted by Conserve

I don't think rotors have part# stamped or embossed in them as part of casting. Easiest way would to confirm 100% is taking two wheels off yourself and check rotor thicknesses. Can you post pic of that paperwork.

This is from yesterday's invoice.

[Midwaymonsters]

Originally Posted by Midwaymonsters

This is from yesterday's invoice.

These are from the invoice from 2020.

[Conserve]

Part numbers I wrote down match with your latest posted document. And this is same dealership told you front discs look small for front and you saying they did the job back in 2020. If my understanding is correct then I will take the car back to them and tell them take the wheels off and measure the thickness which is very easy and go from there.

[Midwaymonsters]

Originally Posted by Conserve

Part numbers I wrote down match with your latest posted document. And this is same dealership told you front discs look small for front and you saying they did the job back in 2020. If my understanding is correct then I will take the car back to them and tell them take the wheels off and measure the thickness which is very easy and go from there.

Will do, thanks! Happy New Year!!

[Midwaymonsters]

Originally Posted by Conserve

Part numbers I wrote down match with your latest posted document. And this is same dealership told you front discs look small for front and you saying they did the job back in 2020. If my understanding is correct then I will take the car back to them and tell them take the wheels off and measure the thickness which is very easy and go from there.

BMW sent me a video explaining that the rear rotors are correct but not the front ones. He said that the diameter and thickness are too small. However, he never did state the size of the diameter and thickness, which is what I'm waiting to hear back now from them.

[Midwaymonsters]

Apparently, according to BMW, the front rotors are 330x20...WTHeck!

[Midwaymonsters]

Originally Posted by Conserve

Front rotors are 348x30
rear rotors are 330x20
I am thinking whomever installed them before got the front & rear rotors mixed up. easy way to confirm will be to take one wheel off front & rear and measure thickness.

The photos that you posted are LCI rotors. Since my 535i is a 2013 (pre-LCI), will these fit?

[Conserve]

Midwaymonsters Your VIN please

Were you able to get in-touch with the shops and see if they changed rotors post 2020, which was done by BMW dealer per paperwork you showed? If other shop did not change them, I am thinking dealer presumably wrote right part# on paperwork for front rotors, but they grabbed wrong rotors (same as rear ones) and installed for front. This is getting interesting....

[ChiltiCoatl89]

Originally Posted by Midwaymonsters

The photos that you posted are LCI rotors. Since my 535i is a 2013 (pre-LCI), will these fit?

You can always reach out to ECS tuning or FCP Euro, have a live chat and they will confirm your OEM Rotor measurements

[Midwaymonsters]

Originally Posted by Conserve

Midwaymonsters Your VIN please

Were you able to get in-touch with the shops and see if they changed rotors post 2020, which was done by BMW dealer per paperwork you showed? If other shop did not change them, I am thinking dealer presumably wrote right part# on paperwork for front rotors, but they grabbed wrong rotors (same as rear ones) and installed for front. This is getting interesting....

One of the two previous shops did not replace the rotors and I'm waiting to hear back from the other. BMW insists that they did not make this error. I'll keep you updated. I don't want to directly ask the previous owner because due to his declining health, I feel it's not appropriate to do so.

[Midwaymonsters]

Originally Posted by ChiltiCoatl89

You can always reach out to ECS tuning or FCP Euro, have a live chat and they will confirm your OEM Rotor measurements

Thanks, ChiltiCoatl89. I chatted with ECS Tuning and they confirmed that they're for 2014+.

[TZ]

I am recently shopping for my rear rotor. I have a 2011 535iX. I replaced my front rotors with 345/30mm (PN: 34 11 6 884 301) in 2020.

[Conserve]

I did not see your VIN. So I went back and configured pre LCI as followings. With that there are two options for front rotors.

Option 1 is bidirectional rotors

Brake disc, lightweight, ventilated, left 348X36, P/N: 34116785669_OTY 1
Brake disc, lightweight, ventilated, right 348X36, P/N: 34116785670_ QTY 1

Option 2 non bidirectional rotors
Brake disc, ventilated 348X30, P/N: 34116884301 _ QTY 2

So, if 2nd shop did not change rotors then is dealer error. Now if they want to own up to it or not is TBD.

[Midwaymonsters]

Originally Posted by TZ

I am recently shopping for my rear rotor. I have a 2011 535iX. I replaced my front rotors with 345/30mm (PN: 34 11 6 884 301) in 2020.

Did you install them yourself? If not, may I ask how much it cost you to have them installed? Are you sure they're 345x30? The initial photos above from Conserve has the same PN listed as 348x30.

[Midwaymonsters]

Originally Posted by Conserve

I did not see your VIN. So I went back and configured pre LCI as followings. With that there are two options for front rotors.

Option 1 is bidirectional rotors

Brake disc, lightweight, ventilated, left 348X36, P/N: 34116785669_OTY 1
Brake disc, lightweight, ventilated, right 348X36, P/N: 34116785670_ QTY 1

Option 2 non bidirectional rotors
Brake disc, ventilated 348X30, P/N: 34116884301 _ QTY 2

So, if 2nd shop did not change rotors then is dealer error. Now if they want to own up to it or not is TBD.

Yes, what you attached is correct. I entered the serial no. of my vehicle on RealOEM.com and that's exactly what it showed. Thanks for your assistance! I'm still waiting to hear back from the other shop. BMW texted me yesterday saying that my "front brake service for your vehicle qualifies for value service pricing. It basically means we can perform that service for approx. 49% off. The front brake service with rotors for your 535i works out to be $611.99 plus tax." Including tax, it comes to $671.66.

[TZ]

Originally Posted by Midwaymonsters

Did you install them yourself? If not, may I ask how much it cost you to have them installed? Are you sure they're 345x30? The initial photos above from Conserve has the same PN listed as 348x30.

Sorry, it's 348/30mm. I bought here https://www.fcpeuro.com/products/bmw...nn-34116775277 and installed myself

[Midwaymonsters]

Originally Posted by TZ

Sorry, it's 348/30mm. I bought here https://www.fcpeuro.com/products/bmw...nn-34116775277 and installed myself

[Conserve]

Midwaymonsters , any update? did you hear back from other shop/