09-11-2018, 05:13 PM | #1 |
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X3/X4 to X5/X6 brake upgrade adapter kit
With this kit, you can run any E70, E71, E72, F15, F16, F85, F86 X5 or X6 front brake setup that you want on the front of your 2011 to 2016 BMW F25 X3 or 2015-2016 BMW F26 X4. Spacers are 304 stainless steel. Hardware includes grade 10.9 OEM equivalent bolts and Nord-Lock safety washers, both zinc geomet coated. Note that the debris/heat shield will require minor trimming to clear some larger brake setups. Here's my write up for the install: X5 brake upgrade for X3 or X4 Pics below show X5 50i brakes on my X3. PM me if interested. Or, just buy them on ebay: BMW F25 X3 F26 X4 brake upgrade adapter kit for X5, X6 brakes
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Last edited by hardparker; 06-12-2022 at 09:30 PM.. |
09-12-2018, 03:21 PM | #3 |
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Three liters, or 3 cc, depending on how you look at it.
Stock X3 calipers are one 56mm piston = 24.63 cm2 in area. The 50i calipers are dual 42mm pistons, 13.85 cm2 each, for 27.7 cm2, total area. That's 3 cm2 difference, or about a 12% increase. That 3 cm2 is about 3cc, maybe. Make it 6cc for both sides. But, you should flush with new fluid and ISTA bleed, so more like three liters if you're installing new calipers and flushing. Maybe less, if you're just doing the front, but you should bleed/flush all four. The other benefits of the 50i, or better yet, X5M calipers, is the increased pad and rotor area, rotor torque, as well as greater thermal mass in the rotors.
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Last edited by hardparker; 09-25-2018 at 05:40 PM.. |
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09-13-2018, 09:12 AM | #4 |
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If you replace the f25 stock front rotor with f15 rotor, any issue with the rotor's center bore size? Is it the same?
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2014 X3 2.8i F25 (Prod.date 2013-10-25) 2006 X5 3.0i E53 (Prod.date 2006-04-05) 2008 X3 3.0si E83 (Prod.date 2007-10-23) |
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09-13-2018, 11:09 AM | #5 |
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Rotor center bore is identical. Brake hoses and pad sensor are compatible. Only the heat shield needs a little trimming.
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09-17-2018, 11:27 AM | #6 |
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I'd like to see a few of these out there with different brake setups. If you're interested in running one of the combinations below, PM me once you gather your hardware and I'll give you a nice discount, if you're willing to provide some good pics of your install.
50i brakes behind 18" wheels E70 X5M brakes behind 20" wheels F85 X5M brakes behind 20" wheels
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Last edited by hardparker; 09-25-2018 at 05:40 PM.. |
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09-19-2018, 10:19 AM | #7 |
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Kits are up on ebay for easy purchase: BMW F25 X3 F26 X4 brake upgrade adapter kit for X5, X6 brakes
I'm curious if anyone would be interested in reconditioned 50i or X5M front calipers at reasonable prices. Ballpark guestimates for pricing, before shipping would be around $350/pair for 50i and around $975/pair for X5M four-piston. I may be able to get hooked up pricing on new X5M six-piston calipers, too.
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Last edited by hardparker; 09-25-2018 at 05:40 PM.. |
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09-29-2018, 11:23 AM | #8 | |
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Quote:
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10-02-2018, 08:06 AM | #9 |
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What brake setup are you interested in, the 50i? I'd probably only want to sell calipers, since pad choices are such a matter of personal preference.
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10-02-2018, 09:54 AM | #10 | |
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Makes sense, I'll be swapping pads around to find a good fit anyways. |
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01-08-2019, 12:19 PM | #11 |
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Will 50i brakes behind 18" wheels work for my F25? Or do I still have to upgrade my wheels to 19"?
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2016 X5 35i F15 (Prod.date 2015-10-01)
2014 X3 2.8i F25 (Prod.date 2013-10-25) 2006 X5 3.0i E53 (Prod.date 2006-04-05) 2008 X3 3.0si E83 (Prod.date 2007-10-23) |
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01-10-2019, 10:40 AM | #12 |
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I can't say for sure. I've never tried or seen them fit behind 18" wheels with these adapters. You're welcome to try and relay the what you find to the rest of us.
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03-06-2019, 10:16 AM | #13 |
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More people are rocking these every day. Get yours before they're gone.
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09-29-2019, 07:01 AM | #14 |
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10-01-2019, 04:14 PM | #15 |
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I do still have some left. They will work for any E70 or F15 front brakes on the front of the F25 and F26.
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Last edited by hardparker; 10-05-2019 at 08:16 AM.. |
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01-08-2020, 03:07 PM | #16 |
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01-10-2020, 09:32 AM | #17 |
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06-12-2023, 08:42 AM | #18 |
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Hi everyone, I want to upgrade my F25 front brakes and as I read, the easiest solution is using F15 calipers with some spacers. Can anyone provide me the dimensions for these spacers? A friend of mine has a lathe and could build me these spacers. Thanks in advance!
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