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      08-19-2017, 03:53 AM   #1
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Disc/rotor issue replaced by BMW under warranty

Hi,

Several people complained about discs/rotors issues with their M2. Apparently BMW agreed to replace it under warranty sometimes... and sometimes not !

In my case they rejected the warranty case :-(

I'd like to understand when they agree to replace it so I propose to start that poll. For those of you affected by discs/rotors issues could you please indicate your mileage and BMW'warranty position (accepted or rejected).

Thanks for your feedback!
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      08-19-2017, 03:54 AM   #2
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In my case, rejected at +/- 12.000KM as considered as a wearing part...
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      08-19-2017, 05:58 AM   #3
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What issues are you referring to exactly? What are the symptoms?
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      08-19-2017, 06:02 AM   #4
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Deformed rotors generating vibrations when braking at high speed
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      08-19-2017, 06:03 AM   #5
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Sometimes further to track use
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      08-20-2017, 11:17 AM   #6
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Have you guys tried running race pads on the street to clear pad build-up?
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      08-21-2017, 09:28 AM   #7
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Accepted at 6000km. They said my rotors were warped but I'm pretty sure it was pad deposit.... Met some M2 owners on track and they all had the same problem after 1 trackday wirh OEM pads.

Order race pads, run them on the street and the rotors will clean up.

Olo, I have a good relationship with my dealer. But they won't do it again..

I ordered a 3 tonne jack and have a quote of 500€ for 4 pagid rs29 pads. Is this a fair price?
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      08-21-2017, 12:33 PM   #8
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Quote:
Originally Posted by lax01 View Post
Have you guys tried running race pads on the street to clear pad build-up?
Yes, and it did not clean up ;-(
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      08-21-2017, 12:40 PM   #9
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Quote:
Originally Posted by M2 Belgium View Post
Olo, I have a good relationship with my dealer. But they won't do it again..
Thanks for the info. My intention was not to ask your dealer to cover my discs, but rather asking my dealer to contact yours to see how he could get the warranty on this...

It seems that there is some unfair customer service between BMW dealers ;-(

500€ for 4 Pagid is exactly the price I paid for mines (including 10€ shipping) with Mosa-Freins in Namur. Where have you bought yours ?

Btw, are you interested in a track night in Francorchamps on 18/9 ? I will attend if I find a babysitter ;-)
=> www.jcldriving.be/tracknight
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      08-21-2017, 12:45 PM   #10
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Warping rotors is almost actually impossible...99% of the time its pad deposit...you could always have the rotor turned on a lathe
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      08-21-2017, 12:47 PM   #11
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Quote:
Originally Posted by lax01 View Post
Warping rotors is almost actually impossible...99% of the time its pad deposit...you could always have the rotor turned on a lathe
That's also what I have discovered very recently, but my question is more to identify under which circumstances does BMW intervene under warranty...
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      08-21-2017, 01:49 PM   #12
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Quote:
Originally Posted by lax01 View Post
Warping rotors is almost actually impossible...99% of the time its pad deposit...you could always have the rotor turned on a lathe
It's better getting them turned on the car, there are special machines that can do this. It makes the disc align to the hubs 100%.

MJ
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      08-21-2017, 01:52 PM   #13
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Quote:
Originally Posted by mjsaville View Post
Quote:
Originally Posted by lax01 View Post
Warping rotors is almost actually impossible...99% of the time its pad deposit...you could always have the rotor turned on a lathe
It's better getting them turned on the car, there are special machines that can do this. It makes the disc align to the hubs 100%.

MJ
Would you have some more info about that ?
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      08-21-2017, 03:20 PM   #14
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Cool

Quote:
Originally Posted by OLO-M2 View Post
Would you have some more info about that ?
This technology has been around for 10 years + now, check this thread out but there are loads of others.
https://www.pistonheads.com/gassing/topic.asp?t=1397091

MJ
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      08-22-2017, 03:14 AM   #15
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I'll be at francorchamps 4/9 with M league, last trackday of the year.

First year of trackdays have learnt me the following

- use street pads on the street, switch to track pads every time on track : Getting everything together to do this myself

- next step : steel brake lines and racing brake fluid, safety first

- MPSS are holding up great, after 4 trackdays they are still only halfway. I will switch to PS4s when they are done . Dedicated track wheels and cup2's are an option in the future

- Stay within the limits of the machinery and yourself
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      08-22-2017, 03:44 AM   #16
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"use street pads on the street, switch to track pads every time on track "
=> did the same this year but not certain that it is a good idea to mix pas compounds actually. I always use (a lot of) brake cleanser and steel wool to clean the disc properly before the pads swap but I would not be surprised that this generated my disc issue ;-(
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      08-22-2017, 11:55 AM   #17
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This could indeed be a problem. I'm looking in to that now but haven't found the answer. It seems some pads do mix well together and some don't. I guess something like ferodo ds2500 and ferodo ds uno are mixable. Not sure yet if OEM pads and pagids can be combined. I read that if the to compounds don't mix they can create a glazed surface which can cause your problems. Try to find a shop that can turn the rotors. I met someone in Zolder who did just that but forgot to ask an adress...
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      08-22-2017, 12:21 PM   #18
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Skip the turning of disks and don't waste expensive race pads on the street. At street temps they are mostly working by friction and not chemical bonding. So you're just grinding off the deposits and will wear faster. Best off re bedding in the brakes using the stock pads . This way your re-establish an even layer of pad deposits for use on the street.
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      08-22-2017, 01:32 PM   #19
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Quote:
Originally Posted by Elwood74 View Post
Skip the turning of disks and don't waste expensive race pads on the street. At street temps they are mostly working by friction and not chemical bonding. So you're just grinding off the deposits and will wear faster.
Also what I had been told by a brake expert... but he also explained that the mix of compound is risky for the discs.

So do you really believe that (low abrasive) street pads are able to remove the race pads deposit ?
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      08-22-2017, 01:48 PM   #20
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Quote:
Originally Posted by OLO-M2 View Post
Also what I had been told by a brake expert... but he also explained that the mix of compound is risky for the discs.

So do you really believe that (low abrasive) street pads are able to remove the race pads deposit ?
What's typically is done, is to keep the race pads on for a short time after the track day. I just leave them on for the long drive back home. The cold race brake pads do a great job of clearing up the rotors for the stock pads I put back on the next day
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      08-22-2017, 03:55 PM   #21
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Quote:
Originally Posted by OLO-M2 View Post
Also what I had been told by a brake expert... but he also explained that the mix of compound is risky for the discs.

So do you really believe that (low abrasive) street pads are able to remove the race pads deposit ?
Sure. Unless your using a pad with odd chemistry. (Dust from Hawk Blues turn to concrete if wet and allowed to dry...)

It's not that they are low abrasive they just have lower operating temperatures. They pickup and deposit in different ranges of temperature. Below temp and they friction abrade, at temp they add chemical bonding to the braking action. Above temp and you don't stop well...

Best practice is a proper cool down lap with as little brake use as possible.
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      08-22-2017, 04:17 PM   #22
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Quote:
Originally Posted by Elwood74 View Post
Skip the turning of disks and don't waste expensive race pads on the street. At street temps they are mostly working by friction and not chemical bonding. So you're just grinding off the deposits and will wear faster. Best off re bedding in the brakes using the stock pads . This way your re-establish an even layer of pad deposits for use on the street.
Correct...I guess I didn't say this but I would always assume proper bed-in after cleaning of rotors

But I think if you try to bed rotors that were just bedded by track pads, you're going to have a bad time
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OLO-M237.50
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