How much rear rotor float? - BMW Luxury Touring Community
 
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post #1 of 11 Old Nov 21st, 2006, 1:33 pm Thread Starter
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Question How much rear rotor float?

I noticed recently that when I am going slowly, I can hear a clunking sound from the rear. I put the bike on the centerstand, and found the sound to be coming from the rear brake rotor, which is fairly loosely attached to the rear wheel hub. I know this is a floating rotor, but how much "float" is there supposed to be?

Just looking to see if this is normal or not.

Thanks,
OB

Bob OB
Sedona, AZ

'08 R1200RT Sand Beige Metallic
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post #2 of 11 Old Nov 21st, 2006, 1:42 pm
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Best fix is an EBC rotor replacement. Not free, but it works. It is about $130.00 delivered if you are a member of either the BMWMOA or BMWRA.

The installation instructions on this site are dead on - just follow them.

Lee Nowell
Black 01, LTC
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post #3 of 11 Old Nov 21st, 2006, 2:13 pm
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Bob,

At 55k mine sounded like a cow bell every time I rode over even the slightest bump in the road. Rotor thickness was well within specs but dealer says they all do this cow bell thing and replacement is on the owner even if the bike were still under factory warranty.

I have heard some folks got theirs replaced under factory warranty. Guess like everything it has a lot to do with the dealer and your relationship with the dealer.

Western extended warranty folks stepped up and replaced it for me. That extended warranty has paid for itself several times over.

Ron Wilkerson
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post #4 of 11 Old Nov 21st, 2006, 2:34 pm
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Quote:
Originally Posted by atps1234
I noticed recently that when I am going slowly, I can hear a clunking sound from the rear. I put the bike on the centerstand, and found the sound to be coming from the rear brake rotor, which is fairly loosely attached to the rear wheel hub. I know this is a floating rotor, but how much "float" is there supposed to be?

Just looking to see if this is normal or not.

Thanks,
OB
I measured a good one, and it had about 0.5 MM (0.020") total side to side float.

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post #5 of 11 Old Nov 21st, 2006, 4:15 pm
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Before I traded in my '05, I had the same problem. I first noticed it at about 8k miles, after 16k miles it was embarrassing to ride over a pothole or a bump. Neighbors looked at me like if I were shaking a large can of bolts. The braking was not affected at all.
Dealer told me that it was not covered by a warranty and replacement was about $500.
I have a brand new '07 now with 900 miles on it and it's still quiet, but I'm affraind it will happen again.
Is there anything that can be done?

BJ
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post #6 of 11 Old Nov 21st, 2006, 4:41 pm
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If the rear rotor sounds like a cowbell GET IT REPLACED! It will never get better, and as the floating rivets wear, it will get bad enough to start wearing a groove in the swingarm. Eventually, it could wear enough that the disk pops loose from its carrier which would be A VERY BAD THING, especially while riding.

The EBC replacement rotor works great and at a much better price than the stock part. Just remember to change out the rear pads at the same time, preferably with the EBC parts as well.

Ken
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post #7 of 11 Old Nov 22nd, 2006, 12:06 am
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On my 05' when it started clanging they replaced the rotor under warranty. T

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post #8 of 11 Old Nov 22nd, 2006, 9:34 am
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Mine too

Mine was replaced under warranty at about 10k miles, have 30k now and no more noise (other than the squeal.....)

Just old, clutchless and clueless
Russ Locke
Lakehills, Texas
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post #9 of 11 Old Nov 22nd, 2006, 6:18 pm
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Warranty replacement

Mine (05) replaced under warranty after the rear disks had worn and scored the rotor at about 18,000km.
Cost me new brake pads only.
The old rotor had float, "too much" according to the service manager.
The new rotor has no float at all!

Still have bloody squealing brakes though, will have to order some EBC's for next pad change.

Chris
Sydney, NSW
2005 Dark Graphite Metallic K1200LT
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post #10 of 11 Old Nov 22nd, 2006, 7:52 pm Thread Starter
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Cool Thought so...

Well at least I know I'm not the only one... man I love this group.

Sounds like the EBC rotor and pads are the way to go, and you said there are instructions on this forum somewhere? In the HOW?

Bob

Bob OB
Sedona, AZ

'08 R1200RT Sand Beige Metallic
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post #11 of 11 Old Nov 22nd, 2006, 7:59 pm
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You can find details of the EBC parts here.

Ken
Pacific NorthWet
'13 Dark Graphite Metallic K16GTLD, 24K miles
'09 Magnesium Beige Metallic K13GT, 63K miles
'03 Anthracite Metallic K12LTC, 66K miles
'02 Mauve Metallic K12LTC, 106K miles and sold
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