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Front disc rattle
Posted: Wed Sep 23, 2020 6:43 pm
by Nick Evans
Hello all. I have a 2009 RT with about 34k on the clock. I have noticed that one of the front discs can be moved a bit when you pull on it. I does not move parallel to the axle, but it can be moved radially. The play is less than a millimetre. One side does it and the other one does not. I suspect some of the spacer washer thingies are beginning to elongate, has anyone else seen this?
Re: Front disc rattle
Posted: Wed Sep 23, 2020 8:43 pm
by Graham88
Some movement is acceptable, it is a floating disc after all. Some models like the k1200 came from the factory with a sloppy rear disc assy. Less than a mil doesnt sound bad
Re: Front disc rattle
Posted: Wed Sep 23, 2020 8:46 pm
by Beagle
I presume there will be wear tolerances on the floating discs. These need to be checked to be sure.
Re: Front disc rattle
Posted: Thu Sep 24, 2020 10:59 am
by Beagle
Dont know if yours is the same.
Fore and aft play may be bobbin wear.
Re: Front disc rattle
Posted: Thu Sep 24, 2020 1:09 pm
by Sullivj
Mine has done the same since I purchased it (at 4,000 miles), now at 13,000. I presumed it's meant to be that way.
Re: Front disc rattle
Posted: Wed Feb 24, 2021 2:40 pm
by RTeousJohn
Recommend you squirt some solvent into each bobbin-washer assembly and give them a tug (by hand not with a mallet) back and forth to clear out accumulated brake dust material. When I ran an oilhead 1100S this reduced odd symptoms of apparently warped discs, and returned brake feel when it had become 'wooden'. Be careful not to breathe the solvent fumes though - many are known carcinogens!