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  #1  
Old 25 Mar 2009
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bmw r850 r1100 master cylinder seals

Does anyone know the size or part number of the seals from any manufacturer for the master cylinder...I know the kit is 30 pounds for 2 seals and piston but feel the need to champion financially challenged amongst us ( me no. 1 ) in the face of you loadsamoney types on here.
So, why buy the piston when all you need is the two seals..I have seen elsewhere someone getting them from ALLIED METRICS in New Jersey but you need to send the old seals in, has anyone got them from U.K.?. Mine are in bike in another country at the mo so thats out..just checking if anyone has sourced them or in fact has two old seals left over from a re-build that I can have to send off for replacement, I will post the part number details on here if successful...many thanks chaps..
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Old 26 Mar 2009
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I assume you mean front master cylinder? If yes then it should be Magura on R850 and R1100s. At least my R1100GS 1998 has Magura and I've replaced the seal once - started to slowly leak in Jordania, but I just needed to top up the reservuar and breaks were fine and carried me home w/o any problem.

Piston+seal kit is not cheap, I paid around 50 EURos if I remember correctly, but you only need to replace it every 3-5+ years or so (I replaced mine first when the bike was 8 years old!). Keep the break oil fresh - if possible replace every year or at least every 2 years - this'll extend seals life considerably, since break oil gets VERY acid in time starting to eat details and seals in the system (this is why I'd rather pefer OEM part that's been given thought on than an aftermarket piece). Breaks (=security) are something where you shouldn't cut down the costs.

The BMW repair kit no. you need is: 32722332037

(No. 20 on the pic):


Try BMW Motorcycle Parts // Welcome for cheaper prices on BMW bits if you can have 'em shipped anyway.

Also the reservoir seal (no. 12 on pic) is starting to wear out on mine (because opening-closing), so on older bikes I'd recommend replace reservoir seal (rubber boot in common language) as well (part no. 32722312421).

Piston is D=20mm and with two anti-phased triangle-profiled seals on both ends if it's any help, but I guess it's very Magura-oriented stuff that's hard to find elsewhere, and even if you find I reckon it'll last considerably less than OEM part ("pay less get less"). I may be wrong on this tho.

Take care, Margus
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Old 26 Mar 2009
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seals

hey..thanks for the info......if all else fails will buy the kit....by the way I have a spare master top/lid seal in good condition that you need...message me at inbox here on hubb and will post that to you free.....cheers.
if anyone else has numbers or used seals still interested..
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  #4  
Old 1 Dec 2009
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Any further progress with this??

I am in the same situation, by the time you convert the price of the "piston kit" to NZ dollars it is just silly... when all that is needed is a couple of rubber seals.
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