BMW K bikes (Bricks)

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1Back to top Go down   Rear Brake sticks Empty Rear Brake sticks on Wed Sep 04, 2019 10:24 am

Thicklotto

Thicklotto
active member
active member
1989 K100rs 8v. The rear brake sticks on , even when I don't press the pedal. It has ABS. It eventually frees its self and cools down.Its happened a couple of times recently. I have cleaned all the pins and pads. Also the front brake lever seems to gain pressure as time goes on . The lever is quite slack initially but builds up.


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K100RS SE 1989/90
    

2Back to top Go down   Rear Brake sticks Empty Re: Rear Brake sticks on Wed Sep 04, 2019 12:44 pm

Dai

Dai
Life time member
Life time member
Rear brake - one of two things:

1. There's crud in the master cylinder blocking the return hole
2. The pedal is adjusted so that the piston is permanently over the return hole.

I favour (1) because you say that it returns 'eventually'. Fortunately the m/c comes apart quite easily for cleaning and overhauling.

Front brake - there's air in the system. As you use the brake the (tiny) bubble is compressed more and more and so the brake hardens up. Left overnight, the bubble gets a chance to expand and give you trouble the following day.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

3Back to top Go down   Rear Brake sticks Empty Re: Rear Brake sticks on Wed Sep 04, 2019 12:59 pm

duck

duck
Life time member
Life time member
Could be that your brake lines are getting old and disintegrating internally.

Motobins has decent prices on braided stainless brake lines.


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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
http://www.ClassicKBikes.com
    

4Back to top Go down   Rear Brake sticks Empty Re: Rear Brake sticks on Wed Sep 04, 2019 4:56 pm

tinyspuds

tinyspuds
Silver member
Silver member
I had a similar problem on the rear after doing the Chi m/c replacement. 
1st, the pedal return spring was missing (so not taking pressure off the m/c)
2nd, the adjustment screw didn’t have the prescribed gap resulting in light, albeit constant, pressure on the m/c


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1985 BMW K100RT + Hedingham HUB and LL’s.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

5Back to top Go down   Rear Brake sticks Empty Re: Rear Brake sticks on Wed Sep 04, 2019 5:17 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
@duck wrote:Could be that your brake lines are getting old and disintegrating internally.
I saw it on one of my bikes.  Brake lines full of mouse turds at the calipers.Rear Brake sticks Dscn3010


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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
    

6Back to top Go down   Rear Brake sticks Empty Rear Brake sticks on Fri Sep 13, 2019 1:24 pm

Thicklotto

Thicklotto
active member
active member
What does chi m/c replacement mean


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K100RS SE 1989/90
    

7Back to top Go down   Rear Brake sticks Empty Re: Rear Brake sticks on Fri Sep 13, 2019 1:29 pm

Laitch

Laitch
Life time member
Life time member
@Thicklotto wrote:What does chi m/c replacement mean
Chinese-manufactured master cylinder.


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1995 K75 73,000 miles
Rear Brake sticks Usa-lo10
    

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