BMW K bikes (Bricks)


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1Back to top Go down   Rear wheel dragging Empty Rear wheel dragging Thu Jul 18, 2024 12:03 am

Yote

Yote
active member
active member
As part of my finally getting around to servicing the bike I bought at the end of last summer I went through and bled the front and rear brakes as well as new pads in the front to solve an extremely weak front brake setup on my 89 100RS.  While the front now feels closer to 85% of where I expect it should be, I noticed today while changing the final drive oil that the rear disc is dragging to the point of being difficult to turn by hand and impossible in reverse and unevenly throughout its travel at that.
Setting aside this likely means I'll need to have the rear reground or replaced at some point, could this dragging be caused by the tension spring (35 21 1 457 049) for the rear master being missing or am I likely going to have to disassemble the rear master to fix this?

    

2Back to top Go down   Rear wheel dragging Empty Re: Rear wheel dragging Thu Jul 18, 2024 1:22 am

jbt

jbt
Life time member
Life time member
It's probably a clogged rear master cylinder, that does not allow brake fluid to flush back.


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Let us enjoy the transient delight
That fills our fairest day.
    

3Back to top Go down   Rear wheel dragging Empty Re: Rear wheel dragging Thu Jul 18, 2024 4:20 am

Laitch

Laitch
Life time member
Life time member
Hoses containing extremely dirty fluid, deteriorating inside passages, or plugged fittings also could be blocking fluid movement. If your hoses are the rubber originals, they are the usual suspects but faulty caliper piston seals can seize brakes, too. Disconnect the brake hose from the caliper, squeeze the hand lever and see if anything oozes from the hose. Smile


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1995 K75 90,000 miles
    

4Back to top Go down   Rear wheel dragging Empty Re: Rear wheel dragging Thu Jul 18, 2024 8:55 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Old hoses can hold a multitude of problems.  Would be good to replace them or at least disconnect them at the calipers and do a good flush with new brake fluid.Rear wheel dragging Dscn3021
Rear wheel dragging Dscn3020


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Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Rear wheel dragging Empty Re: Rear wheel dragging Thu Jul 18, 2024 4:14 pm

yamaguzzi

yamaguzzi
Life time member
Life time member
I'd lose the rubber hoses and go with steel braided lines first off. This change made a big difference in the stopping ability of my K by eliminating the ballooning of the rubber hoses under pressure and also gave me peace of mind. Those rubber hoses break. Had that happen in a car more than once. Brake fluid is dirt cheap and easy to flush. I do mine once a year


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

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