BMW K bikes (Bricks)

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1Back to top Go down   Master cylinder  Empty Master cylinder Fri Apr 10, 2015 10:08 am

Phil63

Phil63
active member
active member
Hi, my bike has sat unloved for 3 years and am in the process of getting her mobile again. First thing I noticed absolutely no front brakes. Dismantled MC, a lot of crud inside which was cleaned. Piston and seals look good, bore is good. Flushed system and primed with syringe through head stock tube. Tried several bleeding techniques but cannot get any pressure. Am reluctant to buy rebuild kit when all looks good, do rubbers shrink with age? Will try the o ring fix but any ideas appreciated.

    

2Back to top Go down   Master cylinder  Empty Master Cylinder Fri Apr 10, 2015 7:19 pm

Tom GR

Tom GR
Life time member
Life time member
G'day, recently had great difficulty in bleeding front MC on the 86 K100RS. Turn handlebars to left lock and put bike on side stand. Fill MC and gently tap brake lever until no more air bubbles can be seen. It worked for me but this technique won't work with ABS. Hood luck Cheers Tom

    

3Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 1:58 am

WoodyAUK75

WoodyAUK75
Silver member
Silver member
I replaced the MC on my 93 K75s which has the brake line going into one caliper and then a copper pipe to the other one. I could not get it bled properly. I took it to the local bike shop for a power bleed, but even then it took them another half hour or so to get it right.

    

4Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 4:31 am

Mossy1200

Mossy1200
Platinum member
Platinum member
I bought a Super Cheap Autos Autos bleed kit and mine took 15mins from dry. The back took 5 mins then I did my zx14r back brake which took another 10mins. Best $15 nz I ever spent.


http://www.supercheapauto.co.nz/online-store/products/SCA-Brake-Clutch-Bleeder-One-Man.aspx?pid=291149#Recommendations
It doesn't show but has a Y intersection and 2 additional short hoses to hook onto both front calipers at the same time. Leave them 1/4 open and just start pumping lever toping reservoir up as required. Its using the hose thickness to not allow as much suck back as is pumped each cycle.

    

5Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 5:20 am

RicK G

RicK G
admin
admin
"It doesn't show but has a Y intersection and 2 additional short"  Difficult to do with ABS and most of the Ks that had that crossover had ABS.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 5:26 am

Mossy1200

Mossy1200
Platinum member
Platinum member
@RicK G wrote:"It doesn't show but has a Y intersection and 2 additional short"  Difficult to do with ABS and most of the Ks that had that crossover had ABS.
The bleed kit has the Y intersection and hoses. Im not sure if your referring to bike or kit.
Not familiar with abs models. Do the still only have 2 bleeding nipples, one on each caliper?
Its hard for me to know whats stock as mine came with r80 4 pot calipers when I purchased the bike and aftermarket caliper adaption mounts. Its also not an ABS model.

    

7Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 5:31 am

RicK G

RicK G
admin
admin
I was referring to the bike but you were apparently referring to the kit. Don't mind me I'll go have a nice kip DOH


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

8Back to top Go down   Master cylinder  Empty Re: Master cylinder Sat Apr 11, 2015 5:35 am

Mossy1200

Mossy1200
Platinum member
Platinum member
@RicK G wrote:I was referring to the bike but you were apparently referring to the kit. Don't mind me I'll go have a nice kip DOH
All good would have been easier if the link showed the whole kit. I found the fact you could open both nipples a real bonus when bleeding and close the first one to pass fluid for a while the other side filled up then open both again to bleed it all.


I got the kit because I struggled to get my top hose fully bleed as it would pump into the large steering head reservoir and the air would rise back up into the top hose. An our and a full brake fluid bottle wasn't doing the trick manually and I think the lower clip-ons and Master cylinder height than the tube was making things worse as it the fluid needed go up and over the master cylinder height.

    

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