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F10 / F11 (2011 - Current)
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  #1  
Old 06-08-2015, 07:26 PM
Dean_S Dean_S is offline
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Bake rotor question 535D

Looking at the rotors on my 2015 535D, both front and rear rotors have raised pads on the "hat" section that look like the rotors were drilled and steel cylinders were pressed in.

Any idea what these are for? I found an image and they appear to be rivets.
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  #2  
Old 06-09-2015, 01:16 PM
Sisyphus987C Sisyphus987C is offline
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The hat is not magnetic probably aluminum. The pins most likely allow the iron rotor to heat up and expand freely without distortion due to different thermal expansion rates. This can be a bit of a trick even with one piece rotors as the hat stays relatively cool

Then again it may have just been an easy way to attach the dissimilar metals with enough flex built into the hat to handle expansion.


Les
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  #3  
Old 06-10-2015, 09:34 AM
Dean_S Dean_S is offline
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I took a magnet and yes, the hat is aluminum. I have never come across this type of rotor before.

This will eliminate the corrosion of the interface of the wheel to the rotor, but will increase corrosion at the rotor-hub interface.
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2015 335d X-drive Space Grey
BMW full diameter compact spare and jack kit
18" wheels, tire repair kit and compressor
Euro spec aspheric mirrors
High security McGard wheel locks [from Europe only]
Full XPEL package
AquaPel rain repellent
Opti-Lube additives
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  #4  
Old 06-10-2015, 11:14 AM
Sisyphus987C Sisyphus987C is offline
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Depends on which it is. If it's just riveted together then yes if there's not a coating in between to prevent.

However, if it's a floating rotor design centered and driven by the pins with a gap between rotor and hat there may not be much if any corrosion.



Les
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  #5  
Old 06-10-2015, 11:40 AM
Dean_S Dean_S is offline
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I was referring to corrosion between the rotor's aluminum hat and the steel wheel hub.
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BMW full diameter compact spare and jack kit
18" wheels, tire repair kit and compressor
Euro spec aspheric mirrors
High security McGard wheel locks [from Europe only]
Full XPEL package
AquaPel rain repellent
Opti-Lube additives
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  #6  
Old 06-11-2015, 09:50 AM
Sisyphus987C Sisyphus987C is offline
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Oh. FWIW I haven't heard of issues there on other cars.


Les
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  #7  
Old 06-11-2015, 01:02 PM
Dean_S Dean_S is offline
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It is common to have wheels that will not come of of the hubs and rotors that will not come off of the hubs. If not doing DIY, you would not know. Also depends on climate and road salt.

I have seen water get behind center caps that is trapped against the hub, creating serous rust.
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2015 335d X-drive Space Grey
BMW full diameter compact spare and jack kit
18" wheels, tire repair kit and compressor
Euro spec aspheric mirrors
High security McGard wheel locks [from Europe only]
Full XPEL package
AquaPel rain repellent
Opti-Lube additives
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  #8  
Old 06-11-2015, 02:47 PM
Sisyphus987C Sisyphus987C is offline
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Bake rotor question 535D

Yes, my posts are the kind that come from a guy who's never picked up a wrench and busted a knuckle.

Try a light film of grease on the wheel pilot diameter on the hub. Seems to help wheels seizing on. Doesn't eliminate it but does seems to reduce corrosion between the brake rotor and wheel hub if the film seals the joint between rotor and hub. Haven't had trouble getting wheels or rotors off since I started doing this umpteen years ago.

Seems like a good time to walk away. Good day.


Les
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