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1Back to top Go down   K100 front brake master cylinder seals Empty K100 front brake master cylinder seals on Thu Apr 24, 2014 1:25 am

cris_aus

cris_aus
active member
active member
Does anyone know where you can get just the K100 (1983 2V non-ABS) front brake master cylinder seals?  I have been searching and can only find rebuild kits including piston, spring etc, and in Australia you just about need to sell the bike to buy the rebuild kit!

Any help would be greatly appreciated!


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Cris_aus

1983 K100 Naked Vin 0004140 Red
    

rosskko

rosskko
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VIP
Give www.motobins.co.uk or http://www.motorworks.co.uk/vlive/Home/index.php a try.

Motorworks part number is BRA10493

MUNICH has the seals for $46.50 + postage (which is usually very quick if you need em asap, but will be Monday earliest due to ANZAC Day)
Part#
3423304RK


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1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

cris_aus

cris_aus
active member
active member
Thanks Rossko, but these are caliper overhaul kits - not for the master cylinder.  The only
rebuild parts I can find for the master cylinder is the complete piston and spring assembly (which includes the seals)
 and costs about $200 in Aus.  I really only need the 13mm rubber seals for the piston as the rear seal is the only worn part.


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Cris_aus

1983 K100 Naked Vin 0004140 Red
    

rosskko

rosskko
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Sorry.
In my early morning haze I misread the post.

Sorry, you have to get the whole shebang with the master cylinder.

This is the part number from Motorworks BRA02356 40GBP plus 10GBP postage



No alternative. Someone obviously is making the rubber seals, but I have not heard of anyone finding out who that is.


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1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

RicK G

RicK G
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I would never replace just one seal because there is a real good chance that you will pay it another visit in the very near future. Never take chances with your brakes it is really very easy to do it right every time.
As RossKo said the kit including all seals is the only way that I know you can get them.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

cris_aus

cris_aus
active member
active member
Hi Rick,

I intend to replace all of the seals (if I can find them).  I don't see much need to replace the piston as it is not a wear part.  I can't find anywhere I can buy a seal kit to replace the wear parts only, and I am a bit reluctant to pay nearly Au$200 for $5 worth of rubber seals.  I can get the whole kit and caboodle from beamer boneyard for about $50 plus $50 postage, and may have to do this if I can't find just the rubber.


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Cris_aus

1983 K100 Naked Vin 0004140 Red
    

RicK G

RicK G
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Couldn't agree with you more about the piston. $50 from Beemer Boneyard is probably as good as you will get.
Motobins or Motoworks would be in the same range and post seems to be a bit cheaper for the small packages from the US than UK
It's probably the only way the thieves can get rid of the hundred thousand pistons they mistakenly ordered 15 years ago.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

RicK G

RicK G
VIP
VIP
Have you considered having a stainless sleeve put in. It's usually round the $100 mark but you probably will never have to touch it again.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

cris_aus

cris_aus
active member
active member
I have read about the stainless sleeves but the bike is quite low KMs (45K on a 30 year old bike) and the cylinder itself is in good nick after a thorough clean.  The rubbers have probably more perished over time than worn through use, so a stainless sleeve is probably not as critical as new seals at this time.


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Cris_aus

1983 K100 Naked Vin 0004140 Red
    

10Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Thu Apr 24, 2014 6:25 pm

charlie99

charlie99
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chris ...over time the bore does become pitted .....not immediately apparent  but water does tend to  build up and find it way down there ...just the nature of brake fluid

a light hone of the bore could well help in the fix once seals are found and before fitting

good luck !


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OK100 front brake master cylinder seals Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

11Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Thu Apr 24, 2014 11:35 pm

sidecar paul

sidecar paul
Life time member
Life time member
I did once put an 'o' ring under the lip of the seal to stop a leak while I was waiting for a new piston assembly to arrive.........it worked so well that I didn't replace the piston assembly for, well, quite a long time.

Of course I wouldn't recommend this, other than a 'get-you-home' bodge.

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

12Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Sat Apr 26, 2014 12:15 am

cris_aus

cris_aus
active member
active member
Not a bad idea Paul.  I quite like the idea of get-you-home bodges, particularly if they work!  I have gone though hundreds of pages of seal catalogues, and spent hours looking on the net at seals of all different shapes and sizes, and have come to the conclusion that the seals I want don't exist except wrapped around a new piston.  Going to have to bite the bullet and get an overhaul kit, but I will try your idea while waiting for the new one to arrive.  Thanks.


__________________________________________________
Cris_aus

1983 K100 Naked Vin 0004140 Red
    

13Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Sat Apr 26, 2014 1:49 am

RicK G

RicK G
VIP
VIP
When it comes to those sort of bits I have found that BMW don't use any special parts but sometimes very hard to find bits.
There will be some seal somewhere that is the right size but as always the trick is finding it. Often the price is no cheaper and sometimes more expensive so you waste an enormous amount of time getting absolutely nowhere.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

14Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Sat Apr 26, 2014 11:48 am

Snod Blatter

Snod Blatter
Life time member
Life time member
I recently went through this same rigmarole trying to find some seals for a ZX-10R master cylinder, no one could supply even similar seals - they exist only in master cylinder manufacturing, it seems, and nowhere else. It's ridiculous that you can only buy them in a kit with other bits you won't need, but that's how it is.


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1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

15Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Sat Apr 26, 2014 10:20 pm

cris_aus

cris_aus
active member
active member
@sidecar paul wrote:I did once put an 'o' ring under the lip of the seal to stop a leak while I was waiting for a new piston assembly to arrive.........it worked so well that I didn't replace the piston assembly for, well, quite a long time.

Of course I wouldn't recommend this, other than a 'get-you-home' bodge.

Paul.

I have honed out the cylinder bore and cleaned everything thoroughly, and tried Paul's 'get-you-home' bodge - and it works!  Bled the brakes and they are solid and the leak has completely stopped.  I will still replace the seals when they get here, but at least the paintwork is now safe and I can put the Gladwrap away!!  Thanks Paul.


__________________________________________________
Cris_aus

1983 K100 Naked Vin 0004140 Red
    

16Back to top Go down   K100 front brake master cylinder seals Empty Re: K100 front brake master cylinder seals on Sat Apr 26, 2014 11:10 pm

japuentes

japuentes
Life time member
Life time member
...tried Paul's 'get-you-home' bodge - and it works!...

That´s very valuable info.
Thanks both
Best regards
JAP


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K100 front brake master cylinder seals 2854237993 1988 K100RS SE/ABS
    

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