[2022M550i]

Just like the title says. I was curious to see if anyone destroyed their M sport brake rotors. It seems to be a pretty damn stout braking system…. But the car is pretty heavy… I figure there would be someone out there doing some 150 mph oh shit heavy braking… any fade or warpage?

[HerkHealer]

Originally Posted by 2022M550i

Just like the title says. I was curious to see if anyone destroyed their M sport brake rotors. It seems to be a pretty damn stout braking system…. But the car is pretty heavy… I figure they be someone out there doing some 150 mph oh shit heavy braking… any fade or warpage?

Nope, not me. I just had mine inspected last week for a sticker. Front pads at 80% rears at 60%, with 14,200 miles on the clock. Not too bad at all!

[GTFISH]

My brakes were replaced at about 15k miles due to some vibration, I had warranty coverage for that so didn't question if it was a warped rotor or pad transfer. For the last 30k miles no issues. Similar thing happened to my 540i, new brakes in 15k miles or so and then no issues for the next 30k. Go figure.

[MelbourneFinn]

Yep, had a 2019 540iX w/Msport brakes in Spain, front rotors replaced at a bit over 40k kms - €2k!!! Ouch! Was out of warranty by 6 mths or so - the best I was able to get out of the BMW dealership in Algeciras was 40% discount on parts and labour… Appears this is reasonably common to Msport rotors - my assumption is that the reasonably heavy vehicle braking from high speeds is tough on the rotors…

[CnSky]

Yes caused vibrations when breaking so I eventually changed them all. Car had only 36k KM. A trick if you want to know if its your front or rear discs is use cruise control to break as it only uses rear brakes to slow the car.

Set cruise to say 80km and drive at 100km then engage cruise recall. The car will slow itself using rear brakes only. If there is no shake using cruise to break it’s your front discs if you do have shake when breaking manually.

[2022M550i]

For those of you that have had the warped rotor issue, was it from high-speed braking?

[Spyder3]

Originally Posted by CnSky

Yes caused vibrations when breaking so I eventually changed them all. Car had only 36k KM. A trick if you want to know if its your front or rear discs is use cruise control to break as it only uses rear brakes to slow the car.

Set cruise to say 80km and drive at 100km then engage cruise recall. The car will slow itself using rear brakes only. If there is no shake using cruise to break it’s your front discs if you do have shake when breaking manually.

OH! THATS WHY THE REAR BRAKES WEAR FASTER THAN THE FRONT!. Thank you for that explanation.

I was surprised to see the rear brakes on my F30 were down to the nubs but the fronts still had plenty of life. Assume the G30 will be the same. I use cruise a lot, and love how it keeps the speed down according to the cruise setting, even on descents. (my Honda does not do this. We have it so good).

[MelbourneFinn]

Originally Posted by 2022M550i

For those of you that have had the warped rotor issue, was it from high-speed braking?

Define high speed… My 540 with warped rotors was in Spain - nobody there drives by speed limit, but not like crazy either… Or who knows, I bought it with 38k kms on it. Perhaps it had had a really hard life… But tbh, I don’t think it’s acceptable that rotors get warped with that little use, regardless of the speeds on road use - what about on the car home land’s autobahns? Frequently +200 km/h, if the speed was an issue they would be replacing brake disks on monthly basis, so must be another explanation…?

Then again, I had to have high performance rotors (all 4) replaced in an Audi RS4 at 45k km…

[emre]

39.000km on the odo, done countless high speed braking (over 250km/h)
Rotors are fine.

Brakes do fade after a few high speed braking though.

[2022M550i]

Originally Posted by MelbourneFinn

Define high speed… My 540 with warped rotors was in Spain - nobody there drives by speed limit, but not like crazy either… Or who knows, I bought it with 38k kms on it. Perhaps it had had a really hard life… But tbh, I don’t think it’s acceptable that rotors get warped with that little use, regardless of the speeds on road use - what about on the car home land’s autobahns? Frequently +200 km/h, if the speed was an issue they would be replacing brake disks on monthly basis, so must be another explanation…?

Then again, I had to have high performance rotors (all 4) replaced in an Audi RS4 at 45k km…

I define high speed braking as > = 100 mph hard braking

Originally Posted by emre

39.000km on the odo, done countless high speed braking (over 250km/h)
Rotors are fine.

Brakes do fade after a few high speed braking though.

That’s what I was looking for. The car is heavy, so I’d expect some fading after a few good high speed hard slow downs.