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      02-08-2017, 02:37 PM   #67
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Caliper Here:
LEFT:
34116776783

RIGHT:
34116776784
Part 34116776784 was found on the following vehicles:

X4 F26   (11/2014 — 01/2017)
X5 E70   (02/2006 — 03/2010)
X5 E70 LCI   (04/2009 — 06/2013)
X5 F15   (08/2012 — 02/2017)
X6 E71   (01/2007 — 06/2014)
X6 F16   (09/2013 — 02/2017)


https://www.realoem.com/bmw/enUS/sho...diagId=34_2395

Rotors Here:
LEFT:
34116871799

RIGHT:
34116871800
Part 34116871800 was found on the following vehicles:

X4 F26   (11/2014 — 01/2017)



https://www.realoem.com/bmw/enUS/sho...diagId=34_1370
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      02-09-2017, 02:13 PM   #68
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Have you looked and maybe putting Hawk Performance pads on it?
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      02-09-2017, 03:48 PM   #69
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Quote:
Originally Posted by pokerface View Post
Caliper Here:
LEFT:
34116776783

RIGHT:
34116776784
Part 34116776784 was found on the following vehicles:

X4 F26   (11/2014 01/2017)
X5 E70   (02/2006 03/2010)
X5 E70 LCI   (04/2009 06/2013)
X5 F15   (08/2012 02/2017)
X6 E71   (01/2007 06/2014)
X6 F16   (09/2013 02/2017)


https://www.realoem.com/bmw/enUS/sho...diagId=34_2395

Rotors Here:
LEFT:
34116871799

RIGHT:
34116871800
Part 34116871800 was found on the following vehicles:

X4 F26   (11/2014 01/2017)



https://www.realoem.com/bmw/enUS/sho...diagId=34_1370
Wouldn't the m40i carriers also be needed as well as the protection plates?
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      02-09-2017, 09:49 PM   #70
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Braided flex lines will help a bit to stiffen up the pedal and reduce pedal travel as they do not expand compared to stock rubber flex lines. Performance pads will change the initial bite and reduce the braking distance. I had Hawk HP plus and they were pretty good. Carbotech makes very good pads. I used to use those for lapping years ago but they make performance street compounds as well.
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      02-09-2017, 10:15 PM   #71
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I use Stoptech Street Performance pads on my 335 (now called Sport), which sees some track days also, and they are great. They don't have the same initial bite as the OEM pads, but they are definitely less dusty, and more linear, so you get used to them pretty quick.

They seem to have a Street pad line now, which is more for daily driving.

They make Centric brake pads, as far as I know, and this might help:

http://www.centricparts.com/index.ph...149&Itemid=224
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      02-20-2017, 08:39 PM   #72
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So I dropped my X3 off at my mechanic today for service.
He just sent me these pictures - seems like the m40i brakes are indeed a direct bolt-on. I'll provide an update once he's finished including impressions and the all the parts needed.
Attached Images
  
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      02-21-2017, 11:08 PM   #73
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Sweet! Looks like the rotor dimensions are 348x30 versus the 328x28 stock brakes. Cost for the whole setup?

I may end up buying a set of 3 series M Performance 370mm brakes for the front. I'm hoping to be lucky and that everything will just bolt up. If not, I'll fab up custom adapters to fit them.

Unfortunately, with our electro-mechanical parking brake setup integrated into the rear calipers, the rear M Performance two piston calipers won't work.

Last edited by hardparker; 02-22-2017 at 10:17 AM.
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      02-22-2017, 08:53 PM   #74
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Quote:
Originally Posted by hardparker View Post
Sweet! Looks like the rotor dimensions are 348x30 versus the 328x28 stock brakes. Cost for the whole setup?

I may end up buying a set of 3 series M Performance 370mm brakes for the front. I'm hoping to be lucky and that everything will just bolt up. If not, I'll fab up custom adapters to fit them.

Unfortunately, with our electro-mechanical parking brake setup integrated into the rear calipers, the rear M Performance two piston calipers won't work.
Yes it's a decent bit larger than our stock brakes; the rotors are also directional which may help in cooling I guess? I've attached a pic of my old rotor versus the new one.

Total cost of parts (Roots, Calipers, Carriers, Protection Plates & Pads) were approximately 1900 USD. I don't think the cost was too steep and my rotors and pads were in need of replacing anyway. I also needed a brake fluid change so I took the opportunity to try Brembo's brake fluid.

The braking does seem much improved so far with better initial bite. The additional weight on the front axle is noticeable though but I guess I'd rather trade a bit of handling for the improved braking! My country is filled with selfish and inconsiderate drivers who may suddenly pull onto your lane without any indication. It has lead to some butt-clenching moments, especially when I'm doing over 100mph so at least this upgrade can give me more confidence in stopping.. before I end up inside someone else's car..

I've always felt that BMW slightly crippled our X3 35i's by offering them with these small brakes when the much lighter 335i came with bigger ones. It does seem that they're correcting this in the next-gen one so I'm hoping this upgrade satisfies me until the-next gen X3M comes along.

Wow, those M Performance brakes would definitely be an awesome upgrade! Maybe I should've waited for you to go this route and follow along if all went well! . Good luck with it and hope you keep us posted with your progress.
Attached Images
  
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Last edited by ina93; 02-22-2017 at 09:01 PM. Reason: Grammar Correction
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      02-24-2017, 12:15 PM   #75
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Hi all, I am new to this forum but have been surfing for information on this forum. It is a great way to get valuable information regarding the bmw X3. Not sure if this helps but I have found a that a company in Hong Kong has managed to install the F series M sport brakes on a F25 series for the front. From the pictures there seems to be no additional brackets. Just the M sport calipers, brake pads and the brake disc. Looks to be the 370mm version. Do see the link for the pictures.
https://www.facebook.com/Zillion.Per...type=3&theater
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      02-24-2017, 11:34 PM   #76
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Quote:
Originally Posted by froggi88 View Post
Hi all, I am new to this forum but have been surfing for information on this forum. It is a great way to get valuable information regarding the bmw X3. Not sure if this helps but I have found a that a company in Hong Kong has managed to install the F series M sport brakes on a F25 series for the front. From the pictures there seems to be no additional brackets. Just the M sport calipers, brake pads and the brake disc. Looks to be the 370mm version. Do see the link for the pictures.
https://www.facebook.com/Zillion.Per...type=3&theater
Woot! Glad I'm not the guinea pig. Can't wait to do this! Thanks for the confirmation, froggi88.




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      03-15-2017, 05:15 PM   #77
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M Performance Break Kit for F30

Wow, looks indeed impressive. Did anybody try this conversion using the F30 kit on the F25 in the meantime and if yes how satisfied are you with the performance of the breaks? We just received our 2017 X3 with M Package, from our perspective the breaks would benefit getting a performance improvement. Thanks.
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      03-24-2017, 10:36 AM   #78
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Im surprised that people are not considering slightly more agressive brake pads on their stock calipers and rotors.

I just traded in my 2009 328i xdrive for an 2011 X3 35i, both on stock brake rotors, pads, and calipers.

Two days after I got the X3, I was really turned off by the poor braking performace of the X3, and ordered a set of Hawk Street Performance 5.0 brake pads, which are not expensive by the way. Did a full brake pad job, on existing stock blank rotors (even if they have a bit of wear and lip on them). I did the Hawk bedding procedure, and Im now happier with the ratio of brake performance, to power+weight.

Stopping distance have noticeably shortened, and brake bit is definitely better. No noise or dust with the Hawk 5.0 pads - the compound is designed for agressive street use. They are obviously not full track pads, designed for high temps and multiple successive hard stops.

I will soon bleed the brakes too, to try to firm up the pedal a little more.

Full disclosure: Im a HPDE instructor for a couple of local clubs, so I know a thing or two about brake fade, brake performance, brake cooling, and brake compounds. I tried about 5 different brake couponds and did a lot of experimenting and DIY brake ducting on my track prepped 2011 BMW 135i. I also rebuilt the calipers with stainless steel pistons, and high temp dust seals from RacingBrake.com.

March 29, 2016 edit: Dont under estimate the value of a good brake bleed. Got my brake pedal nice and firm, and it grabs in the first inch of pedal travel or so. Right where I want it to be, along with fresh Hawk HPS 5.0 performance pads. Goodness of legendary BMW brake performance is back!!!

Key Features of Hawk HPS 5.0 brake pads (from their marketing), which I can attest to so far:
  • Decreased stopping distances
  • Improved pedal feel from initial pressure through entire pedal stroke
  • Minimal fade under Higher Temps
  • High friction/torque hot or cold
  • Gentle on rotors
  • Very quiet, low noise
  • Improved braking over OE pads
  • Extended pad life

Last edited by dcaron9999; 03-29-2017 at 06:09 PM.
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      03-26-2017, 04:11 PM   #79
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I think part of the problem may be too much rear bias. Seems like the front brakes don't do much until you really lay into them. They just don't have a good linear feel to them.

I changed fluid and inspected the brakes yesterday. Front rotors and pads still look new with 45K miles on them. I had to replace the rears a few months ago.
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      03-26-2017, 06:00 PM   #80
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Quote:
Originally Posted by m3bs View Post
I think part of the problem may be too much rear bias. Seems like the front brakes don't do much until you really lay into them. They just don't have a good linear feel to them.

I changed fluid and inspected the brakes yesterday. Front rotors and pads still look new with 45K miles on them. I had to replace the rears a few months ago.
It's crazy isn't it? Wonder if all the e-diff, e-parking brake, auto-Hold, and DSC end up chewing through rear brake pads more nowadays. The pre-owned 2011 X3 35i I acquired about 10 days ago, had rear pads down almost at the wear sensor, fronts were nice and chunky.

I still went ahead and changed to Hawk 5.0 pads at the four corners, since I wanted a brake compound with more bite than OEM, shorter stopping distance, and minimal pedal sink.
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Last edited by dcaron9999; 03-28-2017 at 03:43 AM.
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      03-27-2017, 02:46 AM   #81
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Old school brakes had "smaller" brakes at rear to avoid locking up rear wheels.

For some reason, BMW has gone to more aggressive rears, which they can because ABS will prevent locking up.

My brakes are doing "the job" - good initial bite and will activate ABS when needed - without having to "stand" on the pedal.

Note: many years ago there was conducted an experiment in the US, where it was determined that many - I don't remember the % - did not step hard enough on the brakes to initiate ABS. Since todays cars have "panic help" i.e. system senses velocity of increase in brake fluid pressure, and adds to braking, there are, probably, more "ABS-brakings"
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      03-27-2017, 08:51 AM   #82
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Quote:
Originally Posted by dcaron9999 View Post
It's crazy isn't it? Wonder if all the e-diff, e-parking brake, auto-Hold, and DSC end up chewing through rear brake pads more nowadays. The pre-owned 2011 X3 35i I acquired about 10 days ago, had rear pads down almost at the wear sensor, fronts were nice and chunky.

I still went ahead and changed four corners at once, since I wanted a brake compound with more bite than OEM, shorter stopping distance, and minimal pedal sink.
One of the extra causes of rear brake wear is the x-drive feature of modulating oversteer. In addition to shifting the torque, it uses the DSC braking function. I'm not sure how much this contributes, but it's there!
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      03-28-2017, 09:01 AM   #83
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Originally Posted by dreamingX3 View Post
One of the extra causes of rear brake wear is the x-drive feature of modulating oversteer. In addition to shifting the torque, it uses the DSC braking function. I'm not sure how much this contributes, but it's there!
Its also referred to as e-diff or e-LSD, and has been implemented for a while. My 135i has it too, but I swapped my differential to a Quaife torsen LSD, and also coded off some of the nannies that contribute to e-diff intervention. This uses the rear brake pads and throttle pull back to compensate for oversteering. It's a real nuisance at the track, espescially out of tight turns. You can actually feal the car getting bogged down, and as soon as you unwind the steering wheel, the power and seat shove comes back on ...

Last edited by dcaron9999; 03-29-2017 at 08:42 AM.
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      03-28-2017, 06:17 PM   #84
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I just got a reply back from BMW, the 18" performance breaks, as shown mounted on one of the previous posts, are not listed/recognized as official replacement brakes for the X3. Consequently they strongly recommended to not install them. Too bad.
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      03-28-2017, 06:55 PM   #85
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Quote:
Originally Posted by hardparker View Post
Woot! Glad I'm not the guinea pig. Can't wait to do this! Thanks for the confirmation, froggi88.




whoa that looks nice. What'd it cost you to get a new brake pad with the ///m on it?
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      04-02-2017, 08:47 PM   #86
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I assume that this is the 18" BMW performance brake kit. The calipers come in red, yellow and orange. The price varies depending on the color, saw them from $1700 and up plus installation. What I could not find out yet is whether the kit fits the X3 without modifications, I also did not find any comments describing the change in braking performance.
The challenge remains, even if they fit, that BMW is not officially recommending them for the X3.
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      04-02-2017, 10:18 PM   #87
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I find the stock brakes totally sufficient for what the X3 was designed for. I just changed everything to a Meyle rotor/Akebono pad setup and am pleased with the results. Low dust. No noise. No rust on the rotors.
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      04-26-2017, 09:03 AM   #88
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Quote:
Originally Posted by dcaron9999 View Post
....ordered a set of Hawk Street Performance 5.0 brake pads...
Hawk are difficult to find in the UK - just ordered some DS2500 for mine. Will see how they fare once fitted.
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