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      08-24-2017, 06:42 PM   #1
chentw
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Anyone install new brakes?

I found some M performance brake system but my local bmw dealership said these won't fit in my x4 35i. Has anyone installed any aftermarket brake upgrade?
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      08-25-2017, 12:33 PM   #2
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Interested as well! Ordered a M40i and they told me the same..... Have been looking around, but could not find anything.......
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      08-27-2017, 08:13 PM   #3
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The fronts fit. The rears don't due to the electronic e-brake, iirc.

Edit: Front Brembos from the 3 series don't fit.
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F25 X3 35i M Sport | Frankenfold 6662 | VRSF Race IC | FTP CP | BM3 tuned | XDI-35 HPFP | Stage 2 LPFP | Ethanol mixed | WMI | Oil cooler | xHP | X5/550i brakes

Last edited by hardparker; 10-02-2018 at 08:07 AM..
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      08-27-2017, 11:42 PM   #4
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Quote:
Originally Posted by hardparker View Post
The fronts fit. The rears don't due to the electronic e-brake, iirc.
They fit with the stock caliper mounting bracket?
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      08-28-2017, 09:43 PM   #5
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Quote:
Originally Posted by spucktacular View Post
They fit with the stock caliper mounting bracket?
They have an integral bracket, but, yes, they'll bolt to the hub carrier brake bosses.
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      08-29-2017, 09:11 AM   #6
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Brembo GT Big Brake Kit

I found Brembo fits but its too expensive for me to pull the trigger.

https://www.carid.com/2016-bmw-x4-br...s%5B%5D=Brembo

http://www.autoanything.com/brakes/61A2861A0A0.aspx
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      09-03-2017, 11:03 AM   #7
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Wait replacing M performance brakes is almost $800 without labour?
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      09-05-2017, 12:15 AM   #8
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I just installed StopTech sport slotted (Cyro-treated) rotors and hawk 5.0 pads all around, along with a full brake flush. I can't tell you how massive the difference is from the rusty pieces of shit and crappy pads my x4 35i came with.

I found the OEM brakes on the x3/x4 to be very susceptible to fade under repeated use (high speed, or aggressive braking on a steep incline), the stop tech rotors are much more durable with the cyro-treatment and the slots really do help with heat endurance. The slots also help improve the initial bite, and help prevenr pad glazing. The hawk 5.0 pads are wonderful, very "comfortable", predictable gradual brake bite, high thermal endurance and very very solid in HEAVY rain (I guess the slots helped with that as well).

I can now stop from 90-110mph to 60, VERY aggresively without any fade on repeated attempts. We'll see how this holds up over time as the pads and rotors wear down, but for now they're amazing.

Benefit to cost ratio! I'm very satisfied, and given I'm not tracking, just driving HARD (and I mean that)... they work great!

The rotors aren't the biggest out front, but given the rear bias I think most people are dissatisfied when first driving these cars due to how the DSC module distributes brake force to the rear axle first (supposedly to prevent body lean). Bigger brakes wont help with that, unless the brake coding can be enabled on the DSC module like the F30, which shifts brake force priority to the front.

http://f30.bimmerpost.com/forums/sho...d.php?t=764547

Last edited by spucktacular; 09-05-2017 at 12:22 AM..
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      09-06-2017, 11:36 AM   #9
chentw
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spucktacular Have you code your car yet? Brembo actually does not clear my 19" OEM wheels. I might go with your set up. Did you just replace the two front brakes or did you replace all 4 brakes?
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      09-07-2017, 11:09 PM   #10
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Quote:
Originally Posted by chentw View Post
spucktacular Have you code your car yet? Brembo actually does not clear my 19" OEM wheels. I might go with your set up. Did you just replace the two front brakes or did you replace all 4 brakes?
I haven't had a chance to check the DSC module to see if the values can be modified on our F25/F26 like can be done on the F30.

Given our F25/F26 have 329mm brake rotors in the front and 330mm in the back (less pad surface in the back, but the same diameter give or take), I'm not sure changing the brake emphasis to the front is the best idea, if it's even possible in the DSC module. Yes under light braking, the car would bite quicker, but under heavy braking you're not using the full potential of the "relatively" large rear rotors.

The front rotors are small at 329, but not taking full advantage of the rear axle braking potential puts even more strain on the small front axle.

My point is, the F25/F26 may not have the best initial bite, so keep some space in front of you, but with the right pads/rotors you can get all the braking endurance you need to stop from serious high-speed runs, all day long!

Strong braking capacity, doesn't always mean quick bite or short pedal travel... as much as we may wish otherwise. Job does get done confidently though, with the right setup.

Last edited by spucktacular; 09-07-2017 at 11:43 PM..
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      09-07-2017, 11:34 PM   #11
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Quote:
Originally Posted by chentw View Post
spucktacular Have you code your car yet? Brembo actually does not clear my 19" OEM wheels. I might go with your set up. Did you just replace the two front brakes or did you replace all 4 brakes?
If you go the brembo route:

1) you're looking at 4-5k which might seem reasonable for the right wallets BUT....
2) you need a custom brake caliper bracket to attach them to the wheel hub (it's NOT plug & play bolt-on). Btw, this is your family's life riding on this critical, but totally custom made component... who you gonna trust to get it right?
3) OEM warranty is done on the braking system, the dealer won't have ANYTHING to do with it.
4) ...you need HEAVY 20" wheels to clear the front rotors wearing stupid rubber band tires (you bought a SUV not a 4 series coupe right?)
5) You can't touch the rear brakes because of the electronic proprietary e-brake built into the rear caliper.
6) Brake distribution will be weird, as the DSC will focus on the rear's first before fully utilizing the brembo's out front... kinda defeats the purpose if you think about it.
7) The added weight of large front rotors + 20" wheels, will throw your steering/suspension feel WAY off.. the car will feel like shit, especially if you drive on shitty roads, which is why I personally got a SUV(ish) thing.
8) This isn't an M2, you don't track this type of car and even driving like a hooligan, with good rotors and pads + good brake fluid, you won't push past the physical limits of the OEM calipers + rotor size. I stop from high speed cruises 180-200 to 120 on a dime, without brake fade! If you're pushing an X4 harder than that, you need a sports car!

regardless of cost, brembo's don't really make a lot of sense for multiple reasons. If anything, look at retrofitting the calipers/rotors off the M40i which are a direct bolt on, and a OEM tested configuration.

Last edited by spucktacular; 12-20-2023 at 02:10 PM..
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      09-08-2017, 05:03 AM   #12
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Exclamation Beware of the fakes.

An important video to watch when considering the importance of BMW OEM and other manufactured brake pads.

youtube.com/watch?v=XOyjyY3FBLU

There are some parts I'd consider saving money on by using other manufacturers, but brake pads are not on that list.

I have considered that some manufacturers don't have a premium standard to live by. We're not talking a pair of tennis shoes claiming to be a top quality while actually made by an inferior manufacturer, we're talking brake pads.

I drive a BMW because of the premium standard that my X4 M40i is built to, else i'd have considered a Jeep or something.

Last edited by Mightymaus; 09-08-2017 at 05:23 AM..
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      09-18-2017, 12:11 AM   #13
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Normally I would agree 100% with your statement, but if you're referring to my post, I have to correct you.

The stoptech rotors + hawk pads cost $500 USD more to buy and install versus using the OEM pads/rotors. All the work was done by a BMW dealer. I wasn't trying to save any money here, there's simply NO viable option on the current X3/X4 to upgrade the brakes without spending a LOT of money for Brembo and you still can't touch the back because of the e-brake.

If this is your first BMW, or you haven't gone through any winters with your M40i yet, you'll be surprised how quickly the cheap rotors rust out. Makes me wonder what quality standards BMW set here.

Quote:
Originally Posted by Mightymaus View Post
An important video to watch when considering the importance of BMW OEM and other manufactured brake pads.

youtube.com/watch?v=XOyjyY3FBLU

There are some parts I'd consider saving money on by using other manufacturers, but brake pads are not on that list.

I have considered that some manufacturers don't have a premium standard to live by. We're not talking a pair of tennis shoes claiming to be a top quality while actually made by an inferior manufacturer, we're talking brake pads.

I drive a BMW because of the premium standard that my X4 M40i is built to, else i'd have considered a Jeep or something.
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      09-23-2017, 12:01 PM   #14
chentw
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Thanks for the advice

spucktacular Thanks for the advice. I just bought stoptech rotors and endless mx72 brake pads. Just waiting for the installation now.

https://www.dropbox.com/s/ir62q6as3z....JPG.jpeg?dl=0
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      09-28-2018, 10:48 AM   #15
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Quote:
Originally Posted by hardparker View Post
The fronts fit. The rears don't due to the electronic e-brake, iirc.
Do you know what the 2019 X4 M40i is using in the rear? I haven't found good pictures but the fronts at least look like my M2 brakes and ones the OP posted in the first PDF, part number 34112450468.
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