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12-21-2023, 06:24 PM | #1 |
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M Sport Rotors/Calipers
My rear calipers are part # 44/24/ 345-370. Does this mean I can use a 345 or a 370mm rotor for the rears?
My fronts use 374mm rotors w/ caliper part # 4x40-44/374/36. Also, I don't have the S2NHA (autobahn option) from the vin decoder, but I have the autobahn calipers with the BMW logo on the front and rear. Thanks in advance. Last edited by BlackM750i; 12-21-2023 at 06:41 PM.. |
12-22-2023, 03:37 AM | #3 |
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Thanks. When I go to any of the sites like real oem or the bmw parts catalog using my vin it gives me the part# for 345mm rear rotors and 370mm, so that is why I was wondering.
374mm front, 370mm rear. Got it. Last edited by BlackM750i; 12-22-2023 at 03:50 AM.. |
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12-22-2023, 04:16 AM | #4 |
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So part# 34216860927 is the oem 370mm rear rotor. On many bmw sites, it says it's discontinued and they offer no replacement part # except the 345mm rotor.
When I go to Brembo, they have the interchange part # Brembo Brake Rotor - 09.D901.13 but it says it will not work with my car and keeps suggesting 345mm as do many other sites like FCP, partsgeek, etc. Interchange Part Number: 34216860927 Replaces OE Number: 34216860927 I also confirmed which calipers I have because I took pics of them when replacing my tires yesterday. |
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12-22-2023, 04:26 AM | #5 |
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Now I get new info on this site, which gives the replacement part # and says it fits. When I put the new 370mm part# in on bmw's site, it tells me this part does not fit my car?
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12-22-2023, 05:26 AM | #6 |
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Update: When I change the model year from 2016 to 2017 on the brembo website, it now says part # Brembo Brake Rotor - 09.D901.13 fits. It also notates that it fits "with painted caliper". The calipers are the exact same (part # 4x40-44/374/36), outside of the blue paint.
Is there any other rotor/caliper difference between the 16 and 17+? |
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12-22-2023, 06:13 AM | #7 |
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All 50i, 50d models come with 374x36 front and 370x24 at the back. 348x36 front 345x24 rear come with other models if S2NH (M sport brakes) are not specified. There is also almost 400mm M Performance brakes that can be retrofitted and come as standard on M760.
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12-22-2023, 09:40 AM | #9 |
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That would entail new discs, pads, calipers, heat shields, possibly sensors and EMF electronics. Oh and minimum of 19" wheels. You need to do both axles and code it accordingly or brake force distribution will act up.
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BlackM750i67.00 |
12-22-2023, 10:42 AM | #10 |
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So for the rear, I just called BMW to confirm and they said 345mm.
I went outside and did a rough measurement of the rotor and it's about 13.5" which is is about 345mm. So the front is 374mm and the rear is 345mm. |
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12-22-2023, 02:10 PM | #12 |
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12-22-2023, 04:17 PM | #13 | |
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Edit: instructions says to code it: "Encode the retrofit with the Software Service Station (SSS) via the – Retrofit/Sport Brake – path" I personally don't know what difference it would make if it's not coded in. Last edited by g11hoonigan; 12-22-2023 at 04:26 PM.. |
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12-22-2023, 06:34 PM | #14 | |
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Thanks for the info and part#! |
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12-24-2023, 08:51 AM | #15 |
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So in my additonal research I see that my current rear calipers are the same ones included in the M performance kit. Identical part#'s.
That also answered another question I had. Since the rear calipers with part # 44/24/ 345-370, that must mean it supports rotors that are 345mm and 370mm. The kit has my current rear calipers. Now, it seems that all I need is the front set up with the 395mm calipers, dust shields, etc. and the rear 370mm calipers, dust shields. The front pads for the G12 M760i, Alpina B7, 750i Xdrive are the same. Also confirmed the wear sensor is the same. Last edited by BlackM750i; 12-24-2023 at 06:56 PM.. |
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12-24-2023, 12:45 PM | #16 | |
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Drives: G12 B7,F02 750li,E70 X5M,E46M3
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12-24-2023, 12:48 PM | #17 | |
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Drives: G12 B7,F02 750li,E70 X5M,E46M3
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12-24-2023, 05:30 PM | #18 | |
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Yours looks good. Thanks for the pic. |
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01-02-2024, 11:30 AM | #19 |
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So, I have all of the parts on the way for the 395mm swap to arrive this week, except the dust shields. Apparently every BMW location in the US does not carry these. According to the dealer, they are only available in Germany, with a lead time of about 4 weeks to arrive at the dealer and then be shipped to me.
Does anyone have a source for these? 34-11-6-861-799 34-11-6-861-800 I've seen people bend the 374mm dust shields back slightly and not replace them with the 395mm rotors. Is there any harm in not getting new dust shields appropriately sized for the bigger rotors? Last edited by BlackM750i; 01-02-2024 at 11:43 AM.. |
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01-02-2024, 11:33 AM | #20 |
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I show discontinued part in the USA; i would go with the dealer in Germany route.
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01-03-2024, 02:31 AM | #21 |
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I would get the right shields. Besides keeping radiant heat, coming from rotors, away from suspension parts, it also keeps road elements away from braking system.
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01-03-2024, 05:34 AM | #22 |
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So it looks like ECS has them, also with a different part#. When I look it up on BMW's site, they show they are for a 2017 M760i but they also show they fit a 2016 750i xDrive when I change the car?
When I look the #'s up on eBay, they are selling the shields with these part #'s attached to the hub for 17-22 5 series. Update: I checked my current car and the part#'s are the 797 and 798, so I can't imagine they are used on the 760 as well with larger rotors/calipers. Last edited by BlackM750i; 01-03-2024 at 05:59 AM.. |
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