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K100-forum.com » Technical, repair and troubleshooting » Other K bricks (K75, K1100, K1) General discussion. » K75S Rear Master Cylinder Leak

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1Back to top Go down   K75S Rear Master Cylinder Leak Empty K75S Rear Master Cylinder Leak Thu Sep 01, 2022 2:10 pm

edgeoftheworld

edgeoftheworld
active member
active member
The rear master cylinder is all gunked up and the rear brake doesn't work at all.  I was wondering if I should get a new rebuild kit or a used master cylinder.  On ebay they are roughly the same price.  I'm adding a pic of what it looks like in case that gives any insight on what is the better approach.  I am planning to tackle this myself but I've never done any brake work before.  Looking for suggestions/advice.K75S Rear Master Cylinder Leak Pxl_2010

    

2Back to top Go down   K75S Rear Master Cylinder Leak Empty Re: K75S Rear Master Cylinder Leak Thu Sep 01, 2022 3:16 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
My advice is to just replace it with a $15 Chicom master cylinder.  A quick search will get you to threads where others have done it.  Don't waste your money on the BMW parts.


__________________________________________________
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
    

3Back to top Go down   K75S Rear Master Cylinder Leak Empty Re: K75S Rear Master Cylinder Leak Thu Sep 01, 2022 6:28 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
Point-Seven-five wrote:My advice is to just replace it with a $15 Chicom master cylinder.  A quick search will get you to threads where others have done it.  Don't waste your money on the BMW parts.
Having sorted a few of them myself I have to agree with this. Buy 2 of them if you are worried but to be honest lots are doing it with no issues.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

4Back to top Go down   K75S Rear Master Cylinder Leak Empty Re: K75S Rear Master Cylinder Leak Thu Sep 01, 2022 7:26 pm

duck

duck
Life time member
Life time member
First try something that's free. This works 80-90% of the time for me:

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/master.leak/master.leak.htm


__________________________________________________
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
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
    

5Back to top Go down   K75S Rear Master Cylinder Leak Empty Re: K75S Rear Master Cylinder Leak Fri Sep 02, 2022 12:55 pm

edgeoftheworld

edgeoftheworld
active member
active member
Thanks everybody!  I will try the free thing first, and then follow up with the cheaper option.  I like cheap but effective options!  I haven't ridden the K bike all season because of the damn brake thing.  It's time to do something about it.

    

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K100-forum.com » Technical, repair and troubleshooting » Other K bricks (K75, K1100, K1) General discussion. » K75S Rear Master Cylinder Leak

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