BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   front master cylinder fluid leak  Empty front master cylinder fluid leak Tue Aug 16, 2011 6:40 pm

charlie99

charlie99
VIP
VIP
hey guys ,

just recently i was able to remove the pesky screws to the reseviour of my hand brake and refill it . in the process bled the brakes with new fluid .

about a day later i noticed a drop of brake fluid on my side pocket lid ......oh "what the" ..anyhow i discounted it to the seal at the bottom of the container weeping after the release and now retensioning.

today, some weeks later there is more drips occuring in the same place .....a closer visual inspection reveals that its probably the rear seal to the master piston ...i can see oil all around the pivot and it seems to be eminating from the piston rod


after a ring around, best i can find is the bmw part locally for $146.00 (refurbish kit)

but here is the question ......

am ii likely to find the inside bores or the cylinder corroded ? and then up for the more expensive option of replacing the whole cylinder as well in a few months ....or am i likely to find that the new piston and seals will be good . ?

i imagine that the corroded rod has pushed through the rear seal ...further than normal durring the bleeding event , and hence slightly ripped the rear seal ......brake activation is good with no loss noticeable at all .



thoughts guys ?

    

Inge K.

Inge K.
VIP
VIP
I would have removed the piston and inspected the bore to be shure I got the correct answer, and then ordered.

Inge K.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

charlie99

charlie99
VIP
VIP
havent ordered yet inge .....i can get the same kit landed here from motobins for about $50.00 aussie .

just wondering anybody elses experience with the same issue



will be pulling it out ....as we have a local holiday here today


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Ofront master cylinder fluid leak  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 ..
    

Avenger GT

Avenger GT
Life time member
Life time member
Happened mine a couple of years ago, both front and rear. I opened them up and didn't like what I saw in there, so I replaced both cylinders with new ones from Motorworks. I figured it would be cheaper in the long run, not to mention safer.

    

blaKey

avatar
Life time member
Life time member
8 months ago front one leaked. The bore was corroded. Got a second hand mastercylinder and put a new kit in and all is ok.
If you see corrosion, it'll leak.

Tried a refurbished one from old mate here at BM Shop. The bore was resleeved but the "hole" that the master cylinder sat in was corroded! A new seal didn't work.

I think there is a mastercylinder on Fleabay right now...and of course you can get it new from the 'bins.


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

RicK G

RicK G
admin
admin
I have had 3 done with a stainless sleeve and all are good but I have since found that a new one from Motobins was the same price.

If you decide to resleeve don't get Master cylinder exchange service at Wynnum to do it. I had one done there for the Ford and it was a very rough job and he wasn't prepared to rectify or refund he just reckoned I was a nit picking idiot and I had to call in the fair trading mob to sort him out and ended up getting a new one.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

japuentes

japuentes
Life time member
Life time member
Mine has had leaks at both front and rear, and replacing only the piston (original from maxbmw) has worked fine, but cilinders were checked before deciding.
Best regards
JAP

    

SittingDuck

SittingDuck
active member
active member
Mine leaks too, but from the reservoir.
It seems like the rubber under the cap doesn't seal around the screws properly, and liquid gets out that way (and humidity in).
Any fixes?


__________________________________________________
1985 BMW K100 RS (0040995)
2008 Suzuki Vstrom DL650A
    

RicK G

RicK G
admin
admin
You can buy just the rubber bellows which includes the cap seal http://www.motobins.co.uk/bmw-parts.php?model=K Series You will need to copy and paste this link.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

charlie99

charlie99
VIP
VIP
sitting duck ....check the o ring under the resevoir ....



some news ....well at least ....i flushed out the piston/lever end from outside the cylinder with degreaser till i could ge some squishing eminating from the master cylinder / seal at the back where the rod pokes out of the body .....then went for a ride up and down nebo (nebo is a 31k long windey mountain road one way ......and used the front brake lots) ......so far no oil contamination present anywhere ....but i know itll be back soonish



i will get some funds together and put an order in to the bins in the not too distant future .....thanks for the shared experiences guys ...mucho appreciated

    

Guest

avatar
Guest
Charlie, you can have mine when the 20mm arrives. It's a known working master cylinder.

    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum