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"KRS/GT" Technical Q&A K1200RS/GT Technical Questions/Answers

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  #1  
Old 03-05-2018, 03:02 PM
jetpoweredmonkey jetpoweredmonkey is offline
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K1200RS BMW front brake caliper bolts

Hi all, one of the front brake calipers on my 2002 K1200RS has a rusty bolt that I would like to replace. These are the four bolts that hold the halves of the caliper together. They are not listed as a separate part on the fiche but are M8x40mm button head Torx bolts.

Would anyone know if this is available as a separate part and the part number? Thanks...
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  #2  
Old 03-05-2018, 03:13 PM
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Re: K1200RS BMW front brake caliper bolts

Initially why not introduce yourself as this is your first post? Look here, http://www.i-bmw.com/forumdisplay.php?f=152 and welcome to the site!

Is this what you're looking for?



appears to be part # 34 11 7 713 338 ISA SCREW - M8X32-10.9 ZNS3

from the Max BMW Part's fiche, https://www.maxbmwmotorcycles.com/fi...0&rnd=07242017

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Old 03-05-2018, 03:17 PM
jetpoweredmonkey jetpoweredmonkey is offline
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Re: K1200RS BMW front brake caliper bolts

Thanks for the quick reply! Part #10 in the fiche is not what I'm after, that's the bolt that holds the caliper to the fork. What I need is the bolt that holds the halves of the caliper together - not listed anywhere in the fiche but I bet it is used somewhere else on a BMW, I just have no way to track down the part number.

I'll post in the intro section, good idea!
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Old 03-05-2018, 03:51 PM
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Re: K1200RS BMW front brake caliper bolts

Check this link, if you have your VIN, you may be able to get closer to what you're looking for, good luck, http://www.realoem.com/bmw/select.do?kind=M
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Old 03-05-2018, 03:58 PM
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Re: K1200RS BMW front brake caliper bolts

Thanks buddy - I sent the Max BMW guys a message and hopefully they can track it down. It would be easy enough to do it myself but apparently the fiche search doesn't work based on the item descriptions.
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Old 03-05-2018, 04:07 PM
Lowndes Lowndes is offline
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Re: K1200RS BMW front brake caliper bolts

JetPowered,

BMW doesn't want you to take apart your calipers, that's why no parts. Just go buy a new caliper, it's only $594 ea. Plus freight. Actually, it's the BMW lawyers and AR people who don't want you to take apart your calipers.

Or, you could go to Bevel Haven https://store.bevelheaven.com/Rebuild-Kits-Parts/ They have all kinds of parts for Brembo calipers, bolts, too, it looks like. Be sure to get the correct piston dia's for your brakes. Two dia's on each side.

I took my calipers apart. They're MY freakin calipers. Had to, to clean out the decomposed brake line clogging the calipers and locking my front wheel. I didn't need any parts except for one bolt, just like you. I bought a black phosphate finished bolt (M8??) but the LENGTH is critical to clear the disc, and there were two different lengths. You will need to find the torque somewhere. I used a similar size bolt in AL, 2xD thread depth, but I forget the actual torque, 34 or 36 something like that. VERY simple assembly. The old hand crank kitchen can opener is more complicated. Four bolts and an O-ring.

More split caliper pics here: https://photos.app.goo.gl/kN8PyDxEirl9iVS02

This was AFTER cleaning out the crud:
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Old 03-05-2018, 04:15 PM
jetpoweredmonkey jetpoweredmonkey is offline
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Re: K1200RS BMW front brake caliper bolts

Yep, that makes sense...got to love unrepairable assemblies, but that is the world we live in. If I get tired of it I can always go wrench on my aireheads. Were you able to get piston seals and stuff or did you reuse what you had?

My next thought was to buy a used caliper assembly from ebay for around $50 but that's awfully spendy for one bolt.

I did find a bolt that will probably work, M8x40 from the K1200RS subframe fiche. But it is a "fillister" head rather than "oval". I will pull one out of my subframe and see if it fits if I can't track down the proper one.

07 11 9 902 984 FILLISTER-HEAD SCREW - M8X40-8.8-ZNS3
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Old 03-05-2018, 04:27 PM
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Re: K1200RS BMW front brake caliper bolts

JetPowered,

I think mine were Fillister head hex drive, yours is Torx. Actually, this was done on my 99' R1100S, but its the same difference on the Brembos.

Everything in my calipers was pristine, not even any wear, used all the same seals and rings.

If you have the old black rubber brake lines, you will need to replace them with Spiegler or Galfer PTFE/SS lines. The old type rot from the inside from DOT4.

SORRY about the quadruple posts. Tried everything to delete three but NOTHING worked with the EDIT button. Moderator!!


THANK YOU, Mr. Moderator!!
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Old 03-05-2018, 04:34 PM
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Re: K1200RS BMW front brake caliper bolts

Good to know. Mine is a late model with servo ABS so might be different from yours. Honestly, if the fillister head bolts fit, I might just replace them all, they have a lot better chance of coming out intact years from now compared to the shallower oval head bolts. Lucky for me, it seems the PO kept up on maintenance, brake fluid looks new and he spent his money on a complete Spiegler braided brake hose kit so I don't have to!

Now that I can see under the body panels, I am super happy with my purchase, the bike is squeaky clean and untouched. Just a couple of these minor age-related nitpicks to sort out and it's off to the races.
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Old 03-05-2018, 06:06 PM
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Re: K1200RS BMW front brake caliper bolts

I wonder if you can removed one bolt at a time without the caliper leaking, the clean it up with steel wool or a Drexel tool?
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Old 03-05-2018, 06:11 PM
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Re: K1200RS BMW front brake caliper bolts

Absolutely, the calipers don't need to be rebuilt and I don't think it would be an issue to replace the bolts one by one. The problem is the zinc/cad plating on the bolt is gone, so cleaning it off will only result in rust returning.
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Old 03-05-2018, 10:02 PM
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Re: K1200RS BMW front brake caliper bolts

That's why I Rub'n'Buff mine every once in a while.A little coat of Carnauba Wax/metallic pigments goes a long way at preventing further corrosion and making my "do not remove" bolts look like new.Same applies to the rotor bolts.

Once a year with the small paint brush and slightly diluted with paint thinner Rub'n'Buff.

So 25Ks last year and plenty of salty gravel and salty moisture from? The ocean of course....! Atlantic this time around.Bolts needed a touch up.
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Old 03-06-2018, 06:38 PM
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Re: K1200RS BMW front brake caliper bolts

Quote:
Originally Posted by Lee
I wonder if you can removed one bolt at a time without the caliper leaking, the clean it up with steel wool or a Drexel tool?

Lee,

No need to do it one bolt at a time. The mating surfaces of the two halves need to be cleaned, too. There is a captured square-section O-ring between the two halves in an indent around the hydraulic passage/gallery (see the "After cleaning out" pic above) that is the only thing to be concerned about.

One thing I learned from the disassembly is that the pistons and cyl's are on "dead-end" hydraulic circuits. In other words, when you flush the DOT4 in your brake lines, the calipers do not get flushed.
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Old 03-07-2018, 02:07 PM
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Re: K1200RS BMW front brake caliper bolts

Quote:
Originally Posted by Lowndes
Lee,
One thing I learned from the disassembly is that the pistons and cyl's are on "dead-end" hydraulic circuits. In other words, when you flush the DOT4 in your brake lines, the calipers do not get flushed.

Excellent point. The next brake flush I'm going to remember to push those pistons all the way back in first. That should get rid of most of the bad stuff.
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Old 03-07-2018, 05:36 PM
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Re: K1200RS BMW front brake caliper bolts

Quote:
Originally Posted by olendorf
The next brake flush I'm going to remember to push those pistons all the way back in first.
Which is specified in the service manual.
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Old 03-07-2018, 06:20 PM
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Re: K1200RS BMW front brake caliper bolts

HA! Really? Well I'm a systems programmer and I have to be really desperate to read the manual!
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Old 03-09-2018, 12:09 AM
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Re: K1200RS BMW front brake caliper bolts

You not only need to "push them all the way back in", but HOLD them in with wedges or clamps. I think BMW makes a special tool for only a bazillion dollars. One guy uses a pair of cedar door shims between the pads and discs. The slightest pressure will push them out (like they're supposed to do).

If you are just doing maintenance flushing, it's ok this way. I had to clean out crud.
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Old 03-09-2018, 05:59 AM
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Re: K1200RS BMW front brake caliper bolts

Seems like a lot of trouble for a cosmetic repair.

I can't see those bolts when I'm on my 1997 Taxi, so as long as that fluid is fresh and there's plenty of meat on the pads, I'm happy.
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