Low mileage rotors crack

[aann]

Hi,
Here are some picture of my friend's ride bmw m6 2016 f13 just like mine .
We noticed that his front brake rotors have weird wide crack on them , his car done 18k miles (29k k/m ).
Any body knows if that normal ? Or it just needed to be replaced ?

[BMWDriverX]

http://f10.m5post.com/forums/showthread.php?t=1112127

[aann]

Originally Posted by SoCalM6GC

http://f10.m5post.com/forums/showthread.php?t=1112127

Great Thanx

[Flying Ace]

I find out that due to common features of the F10 M5 and M6, you should ask these technical questions there. There are so many more people there who've seen it all.

[aann]

I drove the car , it does not have any squeeking noise or any vibration during heavy braking .
I dont know , we will see what the technical say about it .

[schnell1982]

For some reason BMW states that the cracks are "normal" and they will not warranty replace them.

[Taheemr]

These are surface fatigue cracks, its debatable if they will swap under warranty as its difficult to know how deep the cracks are and if they will compromise the discs, on an 2016 that shouldnt happen in my view though and i would insist on a good will changeout

[aann]

They are replacing the rotors , the delear say they are not under warranty .
the pads are so thick and the tech guy say there is no need to replace them .
What do you think guys, should we replace the pads too with the rotors ?

[Taheemr]

This is a big big no no, its always good practice to change discs and pads together for uniformity, its the same as taking a shower and using your old pants afterwards, sort of defeats the object.

[aann]

They already did replace thim without the pads 😰😰

[Taheemr]

and this was done by a BMW dealer, in my book this is sloppy work,

In any case you will most probably be fine as the pad is softer than the metal disc so any pad imperfections in surface should be shaved off with the new flat disc. Other may disagree, for peace of mind id pay and get the pads changed.

[aann]

Youre right for sute , they claim that the pads are 90% thick and changing them is a waste of time and money .
We didnt wanna negotiate to much with them .

[Taheemr]

Originally Posted by aann

Youre right for sute , they claim that the pads are 90% thick and changing them is a waste of time and money .
We didnt wanna negotiate to much with them .

Note time just money as the old ones would be out anyway, in anycase it should be ok, any issues you have a 2yr warranty with BMW OE parts

[LI-M5]

ive had em replaced under 4/50 on my 13 2xs and one my 16 once no Q's ask'd , guess its on the serv writer

[aann]

Our dealer here refused to do it under warranty , maybe becuase the car was importet and not bought directly from the dealer .

[LI-M5]

Originally Posted by aann

Our dealer here refused to do it under warranty , maybe becuase the car was importet and not bought directly from the dealer .

Sud'nt matter long as it has warr..

try another dealer !

[aann]

Yesreday i recieve a phone call from my dealer telling me that the rotors where replaced becuase of wearing issue and not becuase they have cracks on them , they receive an email from bmw germany that stated rotors with crack are good to use , and they wont replace thim under warranty .