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      06-04-2014, 12:44 PM   #1
M5Rlz
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Brake Rotors cracking

So today got the call from BMW that BMWNA said they would do a 1 time good will for me because my two front rotors are cracking at the drilled holes, and here is the kicker all FOUR show significant amount of blue colors indicating overheating, so BMWNA thinks I track the car but its never seen the track and that its not normal wear and tare and wouldn't be covered under my 4/40k

Got 17000 miles out of my supersports on the rears and they're at 1mm left lol

But I'm just kinda shocked BMWs second most expensive performance car that I'm not allowed to use the vehicle within spec (who cares if I stop from triple digits a LOT)

I'm trying to get the dealer to get pictures of all four rotors, but I have some of the fronts cracking at home I'll upload later.
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      06-04-2014, 03:03 PM   #2
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      06-04-2014, 03:54 PM   #3
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... so BMWNA thinks the M5 is made for pleasure cruising only. If so, then why charge $100K+, they should be charging 50% for local street use. A fully loaded Honda Accord would do the same job.
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      06-04-2014, 04:08 PM   #4
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Quote:
Originally Posted by bobblehead View Post
... so BMWNA thinks the M5 is made for pleasure cruising only. If so, then why charge $100K+, they should be charging 50% for local street use. A fully loaded Honda Accord would do the same job.
They said my wear after 16k+ miles was "abnormal" and that if it happened again be it heat spotting or cracking they would not cover it either through goodwill authorization or 4yr/40k...

lol and almost all the miles were winter miles since it snowed like nuts up until March


I couldn't agree more, I asked my SA to say thank you to whoever approved the good will but again its absurd given the car I purchased... Not like I brought in a 320i with those problems.
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      06-04-2014, 08:05 PM   #5
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Quote:
Originally Posted by 335iRlz
Quote:
Originally Posted by bobblehead View Post
... so BMWNA thinks the M5 is made for pleasure cruising only. If so, then why charge $100K+, they should be charging 50% for local street use. A fully loaded Honda Accord would do the same job.
They said my wear after 16k+ miles was "abnormal" and that if it happened again be it heat spotting or cracking they would not cover it either through goodwill authorization or 4yr/40k...

lol and almost all the miles were winter miles since it snowed like nuts up until March


I couldn't agree more, I asked my SA to say thank you to whoever approved the good will but again its absurd given the car I purchased... Not like I brought in a 320i with those problems.
It's not absurd at all , even high quality race rotors wear quickly with LOTS of 100+ stops . My PFC track rotors on my dedicated track car only last 9-10 track days before they are at minimal thickness . After 2 track days they have small heat cycle cracking on the surface ( see attached ) much worse than that . That isn't even ready to be replaced in my book , by a long shot . The cracks must extend to another hole or to the edge of the rotor . You're braking from high triple digits "many times " in a 4000 plus pound car and expect no rotor wear LMAO !! Consider yourself reality checked
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      06-04-2014, 10:45 PM   #6
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Quote:
Originally Posted by gmd2003 View Post
You're braking from high triple digits "many times " in a 4000 plus pound car and expect no rotor wear LMAO !! Consider yourself reality checked
lol I didn't say no wear LMAO should re-read (I thought competition package people were smarter guess not)

What I said was its absurd that they classify their own performance car being used exclusively on the street as unusual wear. I didn't say anything about brakes not wearing down.

Fail
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      06-05-2014, 06:02 AM   #7
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Quote:
Originally Posted by 335iRlz
Quote:
Originally Posted by gmd2003 View Post
You're braking from high triple digits "many times " in a 4000 plus pound car and expect no rotor wear LMAO !! Consider yourself reality checked
lol I didn't say no wear LMAO should re-read (I thought competition package people were smarter guess not)

What I said was its absurd that they classify their own performance car being used exclusively on the street as unusual wear. I didn't say anything about brakes not wearing down.

Fail
My point was you essentially are putting the brakes through track use if you are braking a 4000 pound car from triple digits all the time , and they would be justified in not covering a replacement. I also was letting you know that the rotors didn't look bad at all for 16000 miles of that use and certainly didn't need to be replaced yet anyway . BMW is probably the most understanding / accommodating company when it comes to covering wear and year from track use, mods , etc . The tone of you're post was that you were complaining about BMW calling that excessive use for 16000 , and frankly it is for the street . But as usual they covered it , so I don't understand you're complaint ? Get some coffee and stop being a dick lol .
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      06-05-2014, 07:18 AM   #8
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Quote:
Originally Posted by gmd2003 View Post
so I don't understand you're complaint ? Get some coffee and stop being a dick lol .
I don't drink coffee just water and whey

And you missed the point entirely [probably the coffee buzz ] there was no complaint more an observation of practices, and I'd bet good money if NA didn't see I've bought 7 cars in 39 months they might be a little less accommodating, that said they are more accommodating then our MB dealer and Porsche dealer when dealing with nitpicky issues.

Enjoy the coffee
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      06-06-2014, 01:24 AM   #9
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I like this "one time good will" since they have done it several times for me on my previous 650i . One time for unusual worn tire and another time for unusual worn rotor. And yes I had never tracked my car
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      06-06-2014, 08:11 PM   #10
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Cross drilled rotors are shit.

4400#, 560hp, and cross drilled rotors = cracks.

Enjoy the whey.
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      06-06-2014, 08:30 PM   #11
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Originally Posted by turbo8765 View Post
Cross drilled rotors are shit.

4400#, 560hp, and cross drilled rotors = cracks.

Enjoy the whey.
LOL well more than 560 BMS and I really like our stopping abilities

I am enjoying it the MuscleTech Platinum 100% Whey Milk Chocolate is gods gift to whey
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      06-07-2014, 01:20 AM   #12
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I'm gonna check my rotors now when I return in the states. Dude that sucks that they cracked. Makes you wonder if there r giving us pos parts.
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      06-07-2014, 08:39 PM   #13
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Quote:
Originally Posted by boots
I'm gonna check my rotors now when I return in the states. Dude that sucks that they cracked. Makes you wonder if there r giving us pos parts.
There's nothing wrong with the rotors , you heat metal to near a 1000 degrees and then cool it rapidly it cracks . It's called physics lol . If you drive like you're on a race track or actually track a car the rotors develop expansion contraction cracks . That's why true race rotors are slotted not drilled bc you can run them until the cracks reach the edges if the rotor ( in a drilled rotor the cracks can run from hole to hole weakening it faster ) . The downside of slotted is they are noisier and people prefer the look of drilled . At any rate the rotor the OP showed did not need replacement yet , and looked appropriate for 16000 miles on a 4400 pound car that has seen hard street use .
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      06-23-2014, 02:42 PM   #14
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So, would Carbon ceramics solve this issue or at least allow much longer use before it happens? Or are you going to run into problems this early on with similar use?
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      06-23-2014, 03:35 PM   #15
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Quote:
Originally Posted by Desertdweller View Post
So, would Carbon ceramics solve this issue or at least allow much longer use before it happens? Or are you going to run into problems this early on with similar use?
I mean I'm not gonna lie I drive like a shit head and breakdown from 100+ DAILY with at least 10+ limiter runs a week.

So my wear is not the same as someone that might hit 120 once a month or even once a week lol.

CCB as gmd would probably say will help with extending the life of the rotors as they are more tailored to that kind of abuse, that said you could eat through those in a few track sessions as well.
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      06-23-2014, 03:49 PM   #16
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Quote:
Originally Posted by 335iRlz View Post
I mean I'm not gonna lie I drive like a shit head and breakdown from 100+ DAILY with at least 10+ limiter runs a week.

So my wear is not the same as someone that might hit 120 once a month or even once a week lol.
haha.... Thanks for your "honesty" but why you make confusion?
You know how many people will get heart attack if they think their brakes are POS??? lol.... just revise the thread's title and change it to " how to abuse rotors" (JK)
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