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Front Disc In Contact With Caliper
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Moderators: blackSP, space, greatx
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space
Tue Aug 16 2016, 05:21am
a/k/a Jake

Registered Member #15
Joined: Sat Jan 17 2009, 04:28pm

Posts: 238
Regarding torque on the axle bolt: it was originally listed at 40 Nm, as shown in the manual and Reprom. BMW later revised the official recommendation down to 30 Nm. They also replaced the original, aluminum bolt with a steel one. If you still have the aluminum bolt, I would recommend 20 Nm.

In any event, it doesn't take much torque to pull the axle into place. After that, it's the pinch bolts on the fork that actually do the work to hold it.

r083rt -- are your wheels, forks, axle spacer, etc. all stock? Having a few mm of slop in the axle is huge, and enough to indicate something is quite wrong, beyond the ground caliper.
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r083rt
Tue Aug 16 2016, 03:01pm
Registered Member #857
Joined: Fri Oct 02 2015, 09:47am

Posts: 124
As far as I know everything is stock. The previous owner never mentioned that anything was changed out.

Really at a bit of a loss here, I'm going to an independent BMW shop today to see what they can come up with.

I'll update what I find out.
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space
Tue Aug 16 2016, 07:56pm
a/k/a Jake

Registered Member #15
Joined: Sat Jan 17 2009, 04:28pm

Posts: 238
Maybe the PO replaced the bearings with aftermarket ones of the wrong width? That would be pretty boneheaded, but ... yeah, I'm at a loss too. Good luck with it.
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zool
Wed Aug 17 2016, 10:24am
Registered Member #542
Joined: Tue Apr 24 2012, 09:13am

Posts: 35
@ space tnx for info regarding torque change.
@r083rt Plz post what was the BMW shop conclusion.

I bought bike with damaged sumo rim. Wheel was offset and brake hose was rubbing rim. Bolt was striped so rim was 1cm offset. I replaced alu bolt with steel one and now it is ok.

[ Edited Wed Aug 17 2016, 10:25am ]
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r083rt
Wed Aug 17 2016, 10:25pm
Registered Member #857
Joined: Fri Oct 02 2015, 09:47am

Posts: 124
I think there will be a happy ending to this mystery, mates.

After inspection by a more trained eye than mine we found that the wheel spacer had worn a groove in it over time by being allowed to rotate on the axle.

Whether this was caused by somebody not properly torquing the axle at some point or the mechanic also mentioned that if a wheel bearing ever seized before it could have worn the groove. If this was the case and the previous owner changed out the bearings he never bothered to change the spacer.

At any rate, the groove provided just enough slop on the axle to cause the disc to hit the caliper. We also checked the bearings and they are good to go.

So, a ~$25.00 USD part later and the bike should be good to go. I'm waiting for the part to arrive but hopefully no more unexpected surprises!

First picture shows the worn side with the groove and the second showing the machined surfaced that should be there.




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space
Thu Aug 18 2016, 02:35pm
a/k/a Jake

Registered Member #15
Joined: Sat Jan 17 2009, 04:28pm

Posts: 238
Nice! Glad there's a simple fix.
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zool
Fri Aug 19 2016, 11:39am
Registered Member #542
Joined: Tue Apr 24 2012, 09:13am

Posts: 35
Cheers, mate, I am glad you find cause for wheel offset.
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r083rt
Tue Aug 30 2016, 04:16am
Registered Member #857
Joined: Fri Oct 02 2015, 09:47am

Posts: 124
Just a couple pictures of the new spacer and the disc spaced correctly in the caliper after installing the new spacer.




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Outdoors44
Thu Apr 06 2017, 10:04am
Registered Member #521
Joined: Sat Feb 18 2012, 04:40am

Posts: 16



[ Edited Thu Apr 06 2017, 10:05am ]
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Outdoors44
Sat Mar 31 2018, 05:32am
Registered Member #521
Joined: Sat Feb 18 2012, 04:40am

Posts: 16
Sorry, onlty saw this now. I had the same issue. Solved now. Let me know if you have not come right?
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Outdoors44
Sat Mar 31 2018, 05:33am
Registered Member #521
Joined: Sat Feb 18 2012, 04:40am

Posts: 16
Oops, didnt read complete thread. Glad you found the problem.
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