03-03-2019, 06:53 PM | #23 |
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They are not bad with brake dust compared to other German cars. I have my wheels waxed and under normal driving I don’t notice hardly any brake dust. Wheel design also comes into play as well. My wife’s Audi A4 is a pig with wheel dust. 2 miles and you have a coating.
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03-03-2019, 06:57 PM | #24 | |
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03-14-2019, 04:05 AM | #25 |
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Does anyone have the breaking distances for the 50i with standard brakes and the M sport brakes?
A second question.... Better breaks seem like a great idea. I am having second thoughts about the "upgrade". With so many autonomous controls which include braking, I am wondering if it is really good to upgrade the breaks? My sales associate says he can get the M brakes on the standard 50i (as opposed to the M sport version). I jumped at the opportunity, and now I am concerned that it might not have whatever tweaks in the software safety systems that might come with the M sport version, and become a problem instead of a benefit. I believe the m sport brakes will require the 20" wheels as well. I chose to go with the 19" wheels because we have a lot of pot holes in New England and tire damage is too frequent. We just replaced a tire on my wife's seven series due to pothole damage to the sidewall. Do you have any information or opinions on this? The m sport version of the 50i is not an option for me because I want the off road package. Last edited by allent; 03-14-2019 at 07:18 AM.. |
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03-15-2019, 04:08 PM | #26 | |
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03-15-2019, 06:45 PM | #27 |
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Thanks for your response to my question on brakes.
I hope you are also right about the software being unaffected. My sales associate told me that he got a request to upgrade from the standard brakes to the M sport brakes and found that it required new rotors, calipers, and software changes. Last edited by allent; 03-16-2019 at 07:25 AM.. |
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03-19-2019, 04:35 PM | #28 |
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I am considering the m sport brakes but I could not find any published stopping distances for them compared to the standard brakes. I called the BMW genius to see what they could tell me. They could not find any data at first, so they took several days to contact the engineering department to get an answer. They just got back to me today and said that the stopping distance is the same for the regular and m sport brakes. They said the m sport brakes have less heating and brake fade with repetitive braking.
Last edited by allent; 03-19-2019 at 05:21 PM.. |
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03-19-2019, 06:39 PM | #29 | |
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C/D TEST RESULTS 2019 BMW X5 xDrive50i • 456-hp twin-turbo V-8, 8-sp auto, 5253 lb, base/as-tested price: $61,695/$92,405 Zero to 60 mph: 4.2 sec Standing ¼-mile: 12.7 sec @ 109 mph Braking, 70–0 mph: 158 ft Roadholding, 300-ft-dia skidpad: 0.87 g C/D observed fuel economy: 14 mpg 2019 BMW X5 xDrive40i • 335-hp turbo inline-6, 8-sp auto, 4872 lb, base/as-tested price: $61,695/$72,530 Zero to 60 mph: 4.9 sec Zero to 100 mph: 13.2 mph Standing ¼-mile: 13.6 sec @ 101 mph Top speed (governor limited): 129 mph Braking, 70–0 mph: 170 ft Roadholding, 300-ft-dia skidpad: 0.89 g C/D observed fuel economy: 19 mpg Weight: 4872 lb even the much heavier 50i stops way sooner thanks to it's big M Sport brakes so subtract some distance from the M Sport brakes on the 40i BMW is obviously wrong or asked someone who didn't know. C&D tests are usually very good and I can certainly vouch for the 4.2s 0-60 time on the 50i having tested it myself too
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03-20-2019, 10:15 PM | #31 | |
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03-20-2019, 10:19 PM | #32 | ||
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03-21-2019, 04:53 PM | #33 |
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I ordered them. It's a heavy vehicle with a lot of power, so bigger brakes are a good idea for hard driving and even prolonged downhills. Overheated brakes that don't work are very scary!
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03-21-2019, 05:14 PM | #34 | |
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03-23-2019, 10:00 AM | #35 |
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Horrible. The fronts get dusted instantly after washing and then driving.
I am desperately waiting for someone to make ceramic brake pads for this application ASAP! BMW always goes with semi-metallic brake pads on the M brakes which dust like crazy. Can't the realize that 99% or more of their customers are not taking this SAV to the track. They just like the looks. It's really a Brembo thing. They don't make anything but semi-metallic pads for all their production and aftermarket brake systems. They need to catch up! |
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08-05-2019, 08:59 AM | #36 |
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After reading multiples concerns about dust and squeezing noise with the M brakes, I decide to go with regular brakes. I paint them in blue to have the same look. They looks great! But I kind of dissapointed with my decision. M brakes are huge and performance is very impressive in comparison.
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11-09-2020, 03:49 AM | #37 |
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Enjoyed the thread, debating the M-sport brakes, trying to talk my wife into them, she wants an understated look. I was looking for more data on stopping distance, comparing the same model, at least we know there’s less brake fade for the “races” to the grocery store. 😎
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11-11-2020, 12:58 AM | #38 |
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Both braking systems are strong enough to lock up summer performance tires on dry roads until heat soak starts to affect the regular brakes (same braking distance for first couple of hard stops). Advantage comes from stronger calipers and larger discs which are able to accept/dissipate more heat. Only time you will really notice is after repeated heavy braking... performance driving/large hills/heavy loads/etc.
That said, it only takes one instance of brake fade to ruin your day. Last edited by Fennario; 11-11-2020 at 11:13 AM.. |
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04-25-2021, 01:19 PM | #39 |
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M Sport Brakes as solution to reoccurring warped rotor issue
Pls hear me out before you tell me I'm on the wrong thread:
I'm thinking of switching my '21 G05 standard brakes (no 3rd row) with M sport brakes to remedy the below problem. Is this a real solution or is something bigger at play? I have a '21 G05 with 20" wheels with an ongoing "warped rotor" issue that started on a road trip between NY and California. Problem started with less than 5k miles on vehicle. Visited BMW service centers in Memphis, Phoenix, Los Angeles and 4 more times in Santa Rosa CA. They replaced varying combinations of pads and rotors each time. The last time they replaced the whole braking system and problem seemed to be solved for a bit but then came back on drive home from California. Don't drive it hard but we did put a lot of miles and encountered some steep grades here and there. So tired of this issue - hoping that M sport brakes could be the solution. |
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04-25-2021, 01:23 PM | #40 | |
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04-25-2021, 11:49 PM | #41 |
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Not sure M Sport brake will resolve your warp rotor issue. I am having brake shudder problem with M Sport brakes, scheduled a dealer visit as well. When I slow down from moderate speed the whole vehicle vibrates; I feel the pulsating brake and front passenger feel the vehicle vibration - very annoying and takes away the driving fun. Lately I am seeing this issue is being reported by multiple forum members; hopefully it is not a brake-by-wire design issue that is being used with the new mild hybrids. What is worrying is that you are still having issues even after replacing the brake system!
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04-26-2021, 09:39 AM | #42 |
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Yep sounds like similar issue. The shaking has happened to me even when braking from 30 mph. BMW Manhattan service center just machined front rotors and gave me new front pads - based on past experiences I predict that this will last about 2-3 weeks before problem comes back. Bummed to hear that larger brakes may not be the answer but thanks for your feedback.
Really at a loss. No one at BMW seems to take this seriously. May need to fall back on NY lemon law. |
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04-26-2021, 10:02 AM | #43 | |
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I am hopping it is an isolated issue and not a design problem with MY21 mild hybrids and plug in hybrids. Replacing rotors should solve it.
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12-23-2021, 04:51 AM | #44 |
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Is there a size difference with calipers and rotor dimension between an X5 40i M Sport (with the upgraded brakes) and an X5 M or X5 M Competition? I want to use the cross drilled rotors from the comp on the 40i M Sport. I’ve always used cross drilled’s. I have a tendency to warp solid rotors.
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