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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > 335i Minimum Rotor Thickness



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      06-17-2011, 09:51 AM   #1
juice13
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335i Minimum Rotor Thickness

I did try searching the forums first and I'm too cheap to buy a Bentley (yet) to find this information.

Does anyone have the rotor thickness criteria the dealership uses to determine if the rotors (front and rear) need replacing when replacing brake pads? I'm just now out of warranty and both front and rear brake pad sensors have tripped (BRAKE spelled out in red is illuminated and Red car up on lift when start/stopping on dash).

I usually draw the line for DIY when fluid is involved but might attempt a brake 'flush' if I do all the rotors and pads.

Thanks

(2007 sport package with 54k if that matters. I think not)

Also, can I cross-post this in the Brake/suspension section or is that a no-no?
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      06-17-2011, 10:45 AM   #2
968tomr
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I didn't search for the absolute answer, but...

The minimum thickness is stamped on the rotor hat (http://t3.gstatic.com/images?q=tbn:A...dSEu2UhUuIyg6A)
, and there are two indentations on the edge of the rotor (along the cooling fins) that indicate the minimum thickness.

Hope this helps.

-Tom
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      06-17-2011, 11:20 AM   #3
juice13
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Quote:
Originally Posted by 968tomr View Post
The minimum thickness is stamped on the rotor hat (http://t3.gstatic.com/images?q=tbn:A...dSEu2UhUuIyg6A)
, and there are two indentations on the edge of the rotor (along the cooling fins) that indicate the minimum thickness.

Hope this helps.

-Tom

Yes by golly it does. Time to buy a micrometer.

Thanks
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      06-28-2011, 08:44 AM   #4
sfef84
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on my 325 w/idrive.... I had the replace brake bad sensors on for a loooooong time, and put it off. Then, one day the car goes berserk and says "minimum pad thickness," that was like 7 months later (99% highway) IMO... don't change em till you get that message.
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      07-13-2011, 11:54 PM   #5
Glim
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Took a while to find a decent rotor digital micrometer, one that has a pincher that can measure around the rotor lip.
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      07-14-2011, 08:03 PM   #6
chromisdesigns
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Go to an independent shop if you plan on just replacing pads, as BMW dealers will annoy the piss out of you trying to convince you that they "always replace them in sets"...which is true, as long as the car is OUT OF WARRANTY!!! Otherwise, they mike them and if they are ok, only replace the pads...

However, a lot of BMW mechanics DO recommend replacing pads and rotors in pairs, so YMMV on this issue. I just laugh about the dealers, because at 48K miles, they will tell you one thing, and at 51K miles, something else entirely!
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