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Author Topic: Master cylinder rebuild  (Read 1546 times)

k11pfc

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Master cylinder rebuild
« on: May 20, 2011, 02:43:57 PM »

Tomorrow I do my MCR I am not massively confident I know what I'm doing but gonna try so wish me luck and any last minute tips would be welcome.
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frankenduck

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Re: Master cylinder rebuild
« Reply #1 on: May 20, 2011, 03:08:18 PM »

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93 K11LT
94 K11RS- "Kato"
86-97 K75F (K75/100/1100 Frankenbrick)
86 K75C w/ paralever, high perf. cams,TURBO!
91 K1
86 custom K100
and 2 more
IBA #17739 (SS1K, BBG, 50CC)

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k11pfc

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Re: Master cylinder rebuild
« Reply #2 on: May 20, 2011, 05:11:56 PM »

"Regardless, the first thing you want to do is pull the master cylinder apart and assess it's current condition before deciding upon a course of action or spending money"

Well I've already bought a rebuild kit on advice from another forum so I may as well replace it after stripping and cleaning etc. I'll let you know tomorrow if this was sucessful.
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frankenduck

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Re: Master cylinder rebuild
« Reply #3 on: May 20, 2011, 05:16:14 PM »

What year and model?  (It helps others help you if you put that info in your signature.)

Front or rear?
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93 K11LT
94 K11RS- "Kato"
86-97 K75F (K75/100/1100 Frankenbrick)
86 K75C w/ paralever, high perf. cams,TURBO!
91 K1
86 custom K100
and 2 more
IBA #17739 (SS1K, BBG, 50CC)

Buy parts HERE

k11pfc

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Re: Master cylinder rebuild
« Reply #4 on: May 21, 2011, 07:48:25 AM »

Sorry it was a front cylinder rebuild on a 1997 K1100rs, and to my great delight I have completed it in 2 hours, the most difficult part, (for me) was finding retaining screws. Otherwise a doddle. Just going out for a fast hard run to check it out. If I don't post again you will know I buggered it up!!!  ;D
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mystic red

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Re: Master cylinder rebuild
« Reply #5 on: May 21, 2011, 10:57:27 AM »

When I bought my K11LT I had a sticky front caliper. Bike came with all maintenance records and I went through it. No mention of brake fluid change.
I did the bleed and what came out was atrocious. Caliper still sticky. Against strong advice from across the pond I bought a caliper rebuild kit and did the work.  I was told by this person across the pond that invariably, if you split the caliper, it would leak. Not so.....
Anyway, I figured that the master cylinders were going next and I had the source handy for the kits so I pulled the trigger on the front and rear. They still sit in a parts drawer, untouched....maybe someday.
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Scott
'94 K11LT

k11pfc

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Re: Master cylinder rebuild
« Reply #6 on: May 21, 2011, 03:00:39 PM »

No leaks whoopee do.. ;D
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mystic red

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Re: Master cylinder rebuild
« Reply #7 on: May 21, 2011, 03:13:49 PM »

Gotta love that...
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Scott
'94 K11LT

Lawrence

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Re: Master cylinder rebuild
« Reply #8 on: September 20, 2011, 11:17:53 PM »

On the K100RS of 1985 vintage, the front brake m/c reservoir is retained by three long bolts.  I noticed some weeping for brake fluid at the base.  I'd experienced this on airhead m/c too.  There is an o-ring seal at the reservoir base that grows tired.  Anyway, with the bolts that hold the cap on removed, on the airhead m/c you can simply pull the reservoir off the actual master cylinder.  Not so on the K100RS. I check the parts schematic and can't for the life of me see what's holding it in place.  Anyone?
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1985 K100RS

1982 Laverda Mirage 1200TS
1983 BMW R100RS

Inge K.

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Re: Master cylinder rebuild
« Reply #9 on: September 21, 2011, 04:23:49 AM »

Pull straight up, could be some corrosion that make it stubborn.

Inge K.
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blakey

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Re: Master cylinder rebuild
« Reply #10 on: September 21, 2011, 08:11:15 AM »

No it won't pull straight up...there's a small Phillips head screw that comes up from underneath that holds the reservoir on.
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blakey
K100RS 1986 RED!

Inge K.

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Re: Master cylinder rebuild
« Reply #11 on: September 21, 2011, 05:49:02 PM »

Sorry for the wrong answer, did not remember that last screw
(have to blame the age or the beer or both).

Inge K.
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Lawrence

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Re: Master cylinder rebuild
« Reply #12 on: September 21, 2011, 06:54:22 PM »

Thanks for saving me from myself, Blakley.  I went back and had another look at the exploded view of the m/c and found the screw in question.  I don't know how I overlooked it the first time.  Wait!  I know... old age  ::) ::)
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1985 K100RS

1982 Laverda Mirage 1200TS
1983 BMW R100RS
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