BMW AUC Brake Disc Tolerances
Discussion
Morning all,
I bought a 2017 F11 530d earlier this month from a BMW dealer. Car has done 37.5k miles.
It was of course prepared to AUC standards. However, I raised a concern to them with regards to the condition of the front discs, they were corroded, have a lip on them, faint vibration and clearly original. Based on previous experience I would expect discs to last between 35k to 40k in a heavy car like this.
I asked for the AUC report, which they finally provided, see below. So if I read that correctly, they should be replaced at 34.4mm, but just so happened to measure in at 34.5mm. Looking at RealOEM.com the original brakes are 348x36, so I assume 36mm thick. Should I continue to push BMW for replacements? To me they are 94% worn (0.1mm left from a life of 1.6mm).
I bought a 2017 F11 530d earlier this month from a BMW dealer. Car has done 37.5k miles.
It was of course prepared to AUC standards. However, I raised a concern to them with regards to the condition of the front discs, they were corroded, have a lip on them, faint vibration and clearly original. Based on previous experience I would expect discs to last between 35k to 40k in a heavy car like this.
I asked for the AUC report, which they finally provided, see below. So if I read that correctly, they should be replaced at 34.4mm, but just so happened to measure in at 34.5mm. Looking at RealOEM.com the original brakes are 348x36, so I assume 36mm thick. Should I continue to push BMW for replacements? To me they are 94% worn (0.1mm left from a life of 1.6mm).
Edited by scz4 on Friday 22 January 11:27
Definitely deal with the dealer you bought from directly. I would certainly be pushing for at least a significant contribution to the cost. May depend a little on how much you hammered them down on price too - if they didn’t make any money on the car, they may be a little more reluctant.
It’s the BMW Approved dealer to deal with. I had an issue and mine were rectified that route.
As my issue would have been eased by using recovery , I contacted BMW U.K. customer services and they didn’t want to know. I’ve heard similar from others.
The pads look low too.
What’s the mileage to change on iDrive. How close is that to the threshold on the AUC sheet.
Good luck. I believe you have a case.
As my issue would have been eased by using recovery , I contacted BMW U.K. customer services and they didn’t want to know. I’ve heard similar from others.
The pads look low too.
What’s the mileage to change on iDrive. How close is that to the threshold on the AUC sheet.
Good luck. I believe you have a case.
Unfortunately I don't think I'll have much joy based on this information I've obtained which clarifies things:
"The acceptable amount of wear on a disc before a disc needs replacing is 36mm less 2.4mm so minimum disc thickness 33.6mm.
The acceptable amount of wear on a disc before pads can be replaced (using same disc) is 36mm less 1.6mm so minimum disc thickness of 34.4mm. This is the thickness stamped/etched on the disc.
If you need new pads then the discs should be replaced also, if you don't need pads, then you are ok."
"The acceptable amount of wear on a disc before a disc needs replacing is 36mm less 2.4mm so minimum disc thickness 33.6mm.
The acceptable amount of wear on a disc before pads can be replaced (using same disc) is 36mm less 1.6mm so minimum disc thickness of 34.4mm. This is the thickness stamped/etched on the disc.
If you need new pads then the discs should be replaced also, if you don't need pads, then you are ok."
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