BMW K bikes (Bricks)

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John-in-CT

John-in-CT
New member
New member
My 1985 K100RT had been sitting for a couple of years and when I grasped the front brake lever, it wouldn't move. Used more pressure and suddenly the lever lost all resistance and just flopped back and forth with no caliper response. Removed the lever to find the piston solidly seated deep in its bore. There was also no fluid in the master cylinder. There seems to be no way to extract the piston, short of removing and disassembling the entire assembly. It is not  obvious how to remove it. Looks like the grip must be removed so the assembly can slide off the handlebar. Hope someone can clue me in.

    

moriarti

moriarti
Life time member
Life time member
Hi John ,Removal of master cylinder is what you need to do, you will find out on forum if you dont have a manual, Very Happy Very Happy


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1984 k100 rs red/black VIN  0004449
    

duck

duck
Life time member
Life time member
No need to mess with the grip.

Loosen the banjo bolt to the brake line first.

The front master slides towards the center of the bike and off after you remove these two bolts, one in the front and one in the back:

Help on front brake lever assembly removal XiWSzAk

Pour some water into the master cylinder piston and let it sit to see if that will dissolve the dried up brake fluid that's holding it in.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

John-in-CT

John-in-CT
New member
New member
moriarti wrote:Hi John ,Removal of master cylinder is what you need to do, you will find out on forum if you dont have a manual, Very Happy Very Happy
Thanks for the tip. I thought it was going to be more involved.

    

John-in-CT

John-in-CT
New member
New member
Thanks, Duck. Great info and pics. Much appreciated.

    

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