BMW K bikes (Bricks)

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1Back to top Go down   Chicom rear brake master cylinder Empty Chicom rear brake master cylinder on Fri Nov 01, 2019 11:00 pm

brickrider2

brickrider2
Life time member
Life time member
Is this the piece that is pretty much a plug 'n' play replacement for the rear brake system on a K1100LT?
https://www.ebay.com/itm/Motorcycle-Rear-Hydraulic-Foot-Brake-Master-Cylinder-Reservoir-Dirt-Bike-Pit-ATV/312810734373


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1996 K1100LT
    

2Back to top Go down   Chicom rear brake master cylinder Empty Re: Chicom rear brake master cylinder on Fri Nov 01, 2019 11:54 pm

MartinW

MartinW
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Life time member
I used the one with the elongated mounting holes. See here for how to do it there are a couple of ways. Some people have used their OEM hose, some have used an adaptor I fitted a new hose. http://www.motobrick.com/index.php/topic,9364.msg115727.html#msg115727
Regards Martin.


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K75s Hybrid
    

3Back to top Go down   Chicom rear brake master cylinder Empty Re: Chicom rear brake master cylinder on Sat Nov 02, 2019 1:20 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
That looks like the correct type of master cylinder.  The thing you want to check is that the distance between the mounting holes is the same as the OEM unit.  I seem to recall that the distance is 54mm and the master cylinders with elongated holes as Martin has mentioned have the correct spacing.  Best to measure yours.

The good news is that if your brakes are stock, the line will have a banjo fitting that will work without modifications or adaptors.  Early model K bikes had the line screw into the master cylinder, and the Chicom threads didn't match those on the end of the brake line.

You want to replace the line from the reservoir with one that is rated for brake fluid.  There is a report that someone has had this line fail because the fluid ate it.

Outside of the reservoir hose, the only thing you need to do is modify the push rod.  On the three I've done, I ran the nut down until it pressed against the rubber boot.  I cut the pushrod at that point, and then countersunk the end of the rod with a 3/8" drill bit.  The combination of the countersink and the nut forms a pocket to contain the ball end of the pedal's pushrod.


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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