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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Caliper went THROUGH wheel.. and bent backing plate. Q about backing plate (by rotor)



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      09-20-2012, 12:00 PM   #1
Tom (Atl)
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Caliper went THROUGH wheel.. and bent backing plate. Q about backing plate (by rotor)

My rear right wheel is now ruined from the piston caliper bolt that came off causing the caliper to go through the rear right wheel...

So I need one wheel (18 inch, 5 spoke wheel from the 335i coupe).

It also bent the backing plate behind the rotor.

I asked the shop if the bent parts on the backing plate could be trimmed away, the shop says it's important to replace it (so it reduces dust on the back of the rotor, and for cooling). Still not sure if it's 100% needed, but that's what they said.

So just because of needing to change the backing plate, they need to remove & replace the wheel bearing, and possibly the hub.

Does all that seem needed?

I may need a new caliper too, but they don't know yet.
I also need a new wheel & tire.

It will probably be $900 before caliper / wheel / tire.

What do you guys think about the backing plate needing to be replaced? Is it necessary?

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Last edited by Tom (Atl); 09-20-2012 at 02:54 PM.
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      09-20-2012, 12:09 PM   #2
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I came to this thread expecting pics.

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      09-20-2012, 12:45 PM   #3
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This may be a dumb question, but is the backing plate the dust shield? If so, I'm running without the dust shield now. I did a 325i --> 335i brake conversion, and the dust plate needed to be trimmed off (pretty much completely) to get the rear rotors to fit. Yes, i have some brake dust, but I haven't noticed anything problematic. On top of that, I know quite a few other members have done this brake conversion -- most of whom are running without the dust shield.
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      09-20-2012, 02:55 PM   #4
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Originally Posted by JS-NA.E92 View Post
I came to this thread expecting pics.

pic added just for you!
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      09-21-2012, 11:08 AM   #5
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Quote:
Originally Posted by SE3P_to_E90 View Post
This may be a dumb question, but is the backing plate the dust shield? If so, I'm running without the dust shield now. I did a 325i --> 335i brake conversion, and the dust plate needed to be trimmed off (pretty much completely) to get the rear rotors to fit. Yes, i have some brake dust, but I haven't noticed anything problematic. On top of that, I know quite a few other members have done this brake conversion -- most of whom are running without the dust shield.
Yes, it's the same - thanks for the info, that helps me be more comfortable with not having the shield there.
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      09-21-2012, 06:28 PM   #6
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Wait, how/why did you bolt come off? Sounds like it was pretty violent when it happened.
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      09-21-2012, 06:36 PM   #7
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I think the shield will probably be the least of your worries price wise, they are only like $25-$30, and are pretty easy to install.

Any clue how the bolt worked its way loose? This is why I always use a torque wrench on those bolts, and put loctite blue on them, just to ensure they don't back out...its a bad day if it happens as you found out.

Good luck with the repairs.
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      09-22-2012, 09:52 AM   #8
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I honestly don't know the specifics of replacing that shield... but... yikes, that must have been a pucker moment when that caliper came off. I'm guessing that tire got a little flat spot on it?
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