K11 Owners Group

BobZ(IL) · Posted: Tue May 18, 2010 8:46 pm Post subject: Rear Master Cylinder Question

Rear master cylinder has started leaking now that I have things fixed with the front brakes.

Stupid question, but consider the source, how do you unattach the clip holding flexible line from reservor to the master cyl. without destroying it?

Thanks in advance for the help.

Bob
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'93 K1100LT
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'05 R1200GS
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Live well, do good work, enjoy the ride.

Scott_Anderson · Posted: Tue May 18, 2010 9:01 pm Post subject:

I think it's one of those oetiker type clamps. Like the ones on the fuel lines and TB boots.

Unfortunately they are a 1-time use clamp.

I'm sure someone will correct me if I'm wrong, but that's what I remember about them.
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lrome48 · Posted: Tue May 18, 2010 9:40 pm Post subject:

You will have to destroy the clip, and replace it with a small spring clip or hose clamp style clamp. No worries, it's the resevoir gravity feed line and not under pressure so a spring clamp works fine. Or, pony up for the crimp tool and use a factory crimp clamp.

Sometimes you can pull the hose off without removing the clamp, then recrimp it with pliers during reinstallation.
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Larry
K75
97 K1100 LT Specialk under construction
87 SpecialK75 Carols done!
2004 K12 Special the 'Beast' delivered
K1100 Standard Custom Gone but not forgotten

BobZ(IL) · Posted: Tue May 18, 2010 9:49 pm Post subject:

Thanks for the replies, I have some really small hose clamps that I'm sure will work.

I may make HM yet.
_________________
'93 K1100LT
'78 R100S
'05 R1200GS
BMWMOA, CRBMWOA, ABC, K11OG #997

Live well, do good work, enjoy the ride.

Naked Hoof · Posted: Tue May 18, 2010 11:43 pm Post subject:

If you're just rebuilding it with the kit from Beemer Boneyard, you don't need to remove that. You can do the rebuild with it still attached. ou have to drain the system anyway, so...
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Flying Duck · Posted: Tue May 18, 2010 11:53 pm Post subject:

In my experience you don't need to remove it. A lot of the time it's just crap that has dried up and leaked in the MC. Pull the set screw, clean up the bore with some steel wool, clean off the rubber seals on the piston and all is well. You don't even need to buy a $50 rebuild kit.
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lrome48 · Posted: Wed May 19, 2010 9:39 am Post subject:

Be careful if you rebuild it to make certain the pressure relief port is clear. It will clog easily and the caliper will seize.
_________________
Larry
K75
97 K1100 LT Specialk under construction
87 SpecialK75 Carols done!
2004 K12 Special the 'Beast' delivered
K1100 Standard Custom Gone but not forgotten

BobZ(IL) · Posted: Wed May 19, 2010 8:53 pm Post subject:

Got everything apart and cleaned up. Did not have a rebuild kit. The nastiest piece was a little plunger with an o-ring in front of the piston.

Took a long test ride and everything looks dry. Heading out to HM at first light tomorrow. May the hawk be with me.

Thanks for the advice.
_________________
'93 K1100LT
'78 R100S
'05 R1200GS
BMWMOA, CRBMWOA, ABC, K11OG #997

Live well, do good work, enjoy the ride.

lrome48 · Posted: Wed May 19, 2010 9:32 pm Post subject:

BobZ(IL) · Posted: Wed May 19, 2010 9:59 pm Post subject:

lrome48 · Posted: Wed May 19, 2010 10:03 pm Post subject:

Yes, I had them give both signs. I hope see you in Redmond Bob.
_________________
Larry
K75
97 K1100 LT Specialk under construction
87 SpecialK75 Carols done!
2004 K12 Special the 'Beast' delivered
K1100 Standard Custom Gone but not forgotten