Rear brake caliper bolt went missing... - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old May 3rd, 2014, 11:42 am Thread Starter
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Rear brake caliper bolt went missing...

I picked up my 2004 K12GT from the BMW dealer yesterday morning and was within 30 miles from home when I heard some howling from the rear brake area. I stayed off the brakes as much as possible and when I parked the bike in the Shop, I noticed that one of the four 8mm allen head bolts was missing from the caliper. A new one has been express shipped to me. Any special instructions for putting this bolt in, and should I use some blue loc-tite? I appreciate all of your responses.

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post #2 of 7 (permalink) Old May 3rd, 2014, 4:54 pm
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Four bolts there for sure but the two "inner/upper" ones are to hold the caliper halves together. The service manual has some big "Achtungs' as not to remove them in any attempts at rebuilding calipers. From what we have seen there is a 50/50 chance the caliper may leak.

So assuming that one of the other twos went missing, that's the bolts holding the caliper to the rear drive. If that's the case torque to specs no Loctite. No way they'd come off on their own....would make me question "previous work" in that area.

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post #3 of 7 (permalink) Old May 3rd, 2014, 6:48 pm Thread Starter
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Originally Posted by H96669
Four bolts there for sure but the two "inner/upper" ones are to hold the caliper halves together. The service manual has some big "Achtungs' as not to remove them in any attempts at rebuilding calipers. From what we have seen there is a 50/50 chance the caliper may leak.

So assuming that one of the other twos went missing, that's the bolts holding the caliper to the rear drive. If that's the case torque to specs no Loctite. No way they'd come off on their own....would make me question "previous work" in that area.
The bolt that is missing is the one on the lower left. I don't intend to point fingers at anyone here, but is this bolt one that would have been removed and then re-installed after checking the brake pads for the 24,000 mile service? I am at a loss as is everyone with whom I have spoken about the issue.

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post #4 of 7 (permalink) Old May 4th, 2014, 12:09 am
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see attached pdf file with the brake diagram and torque specs
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File Type: pdf BMW.K1200RS.03.2001_rear-brake.pdf (226.9 KB, 66 views)

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2005 Dark Graphite Metallic K1200LT
2005 Orient Blue Metallic K1200GT SE
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post #5 of 7 (permalink) Old May 4th, 2014, 7:27 am
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Quote:
Originally Posted by TexasAgman
The bolt that is missing is the one on the lower left. I don't intend to point fingers at anyone here, but is this bolt one that would have been removed and then re-installed after checking the brake pads for the 24,000 mile service? I am at a loss as is everyone with whom I have spoken about the issue.
Removal is not required to check the pads....Pull the plastic cover off and you can see what percentage is left on the friction material.
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post #6 of 7 (permalink) Old May 4th, 2014, 8:47 am
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Quote:
Originally Posted by TexasAgman
The bolt that is missing is the one on the lower left. I don't intend to point fingers at anyone here, but is this bolt one that would have been removed and then re-installed after checking the brake pads for the 24,000 mile service? I am at a loss as is everyone with whom I have spoken about the issue.
All I can say...them pads are hard to see and check for wear without removing the caliper. There are two ways to go about that, one is remove the pads from the caliper and check. Then the caliper dosn't have to come off.15 minutes????

Other way and probably faster is to remove the caliper, do a quick visual inspection and re-install. 5 minutes???

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post #7 of 7 (permalink) Old Dec 17th, 2015, 3:08 pm
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Thanks for the post, very interesting information!
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