BMW K bikes (Bricks)

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MartinW

MartinW
Life time member
Life time member
Chinese master cylinder for $13.30 AU easy replacement. A guy from another site found these, a few variations on fitting them. You just need a 6mm to 8mm barb hose reducer, a new hose, a new brake pedal bolt with a recessed head do this with a Burr grinder electric drill or a lathe. I ended up moving the lock nut to the rear of the bolt so I could fit an aftermarket boot $4.00 Au.



Last edited by Two Wheels Better on Tue May 16, 2017 7:01 pm; edited 2 times in total (Reason for editing : Spelling error/clean up images)

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I will be forever grateful to Martin for telling me about this master cylinder.  For the first time since I took it under my wing, my RT has a firm brake pedal.

It's amazing how easy it was to install this $7 master cylinder and how the results were so much better than what I got for the $200 I wasted on the OEM master cylinder.

Cheap and easy master cylinder replacement Instal10

It didn't take much longer than a rebuild to modify and install this master cylinder.  With the black paint it looks OEM.

One note: With the reservoir hose entering at the bottom of the master cylinder, some air is going to want to stay in the hose.  To make bleeding faster, I had to "milk" the air bubbles out by squeezing the hose until no more bubbles came up to the reservoir before pumping the pedal to bleed the system.



Last edited by Point-Seven-five on Mon May 15, 2017 12:33 am; edited 3 times in total (Reason for editing : added photo and additional text)


__________________________________________________
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
    

blacKbricK

blacKbricK
Silver member
Silver member
Could you share where you got the Master cylinder and Boot from Martin?


__________________________________________________
1987 K100RS VIN. 0143696K100 RSCJ ---- 1987 K100RT (Police) VIN 0095288 (Adopted from blaKey)  Plus 1998 R1100GS,   1980 Z1000ST, 1980 CB750,2005 Honda XL650V Transalp,1993 KLX650, 1998 DR250,1977 CR125 Elsinore and looking for more K bikes.( I'm hooked).
    

MartinW

MartinW
Life time member
Life time member
Source of M/Cyl is Ali heaps of them but you need the one with the slotted mounting holes shop around and you might even find a cheaper one. Look up universal or Honda Or Yamaha I paid $13.33 Au shipped to OZ. I also have one as a spare. https://www.aliexpress.com/item/Audew-Universal-Rear-Motorcycle-Dirt-Pit-Bike-Hydraulic-Master-Oil-Brake-Reservoir-Cylinder-Gold/32601326433.html?
The source of the boots is Glen a really nice helpful guy from Stainless Steel Sleeving Shop 22/193 South pine Rd Brendale Ph O7 3889 6669 boots are $4.00 Au. He also sleeves front M/Cyl's in stainless guaranteed and tested $200.00 Au. Once done replacement rubbers are $10.00 Au. And he will ship. Turn around on M/Cyl sleeving is approx 2 weeks.
He does not like doing rear M/Cyl on Bricks as invariably the plastic fitting that goes to the reservoir breaks and he has to make a new one out of brass with an "O" ring seal. A local brake place in Lawnton made up the brake hose on the spot $60-$70.00 I think. The 6mm- 8mm barb hose reducer I made on my ancient lathe but these can be had on Ebay. If you need any more information just ask.
Regards Martin.



Last edited by MartinW on Sun May 14, 2017 11:55 pm; edited 1 time in total (Reason for editing : left out address)

    

blacKbricK

blacKbricK
Silver member
Silver member
Thanks for that I will have a look. All the best. John.


__________________________________________________
1987 K100RS VIN. 0143696K100 RSCJ ---- 1987 K100RT (Police) VIN 0095288 (Adopted from blaKey)  Plus 1998 R1100GS,   1980 Z1000ST, 1980 CB750,2005 Honda XL650V Transalp,1993 KLX650, 1998 DR250,1977 CR125 Elsinore and looking for more K bikes.( I'm hooked).
    

MartinW

MartinW
Life time member
Life time member
Glen could also be a source for M/Cyl cup rubbers.



Last edited by Two Wheels Better on Tue May 16, 2017 6:56 pm; edited 2 times in total (Reason for editing : Redo pictures)

    

RicK G

RicK G
VIP
VIP
Thanks Martin that is good info for me and many others. BTW welcome to our Knuthaus


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

MartinW

MartinW
Life time member
Life time member
The first picture posted is the final version with the larger boot. In order to fit the boot I had to slot the end of the bolt and move the lock nut to the rear. In order to move the locknut to the rear a small amount of metal has to be ground off. The added benefit is that now all of the contact area between the M/Cyl and the brake adjuster bolt is fully covered.
Regards Martin

    

Gaz

Gaz
Life time member
Life time member
Is there anyone else not seeing Martin's photos?

By the way Martin +1 on what RickG said, another great example of the value of this forum with members around the world contributing ideas and information.

Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

Waz

Waz
Life time member
Life time member
I can't see them


__________________________________________________
1988 K100 RS
1999 K1200 RS
1987 K100RS DJP sidecar
    

Chocolate

Chocolate
Life time member
Life time member
@MartinW wrote:The first picture posted is the final version with the larger boot. In order to fit the boot I had to slot the end of the bolt and move the lock nut to the rear. In order to move the locknut to the rear a small amount of metal has to be ground off. The added benefit is that now all of the contact area between the M/Cyl and the brake adjuster bolt is fully covered.
Regards Martin

Hey Martin!

We can't see the pictures.
You have linked them to your Computer Hardisk but you have to upload them.

Maybe this link helps
https://www.k100-forum.com/t998-posting-pictures-and-movies

Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

MartinW

MartinW
Life time member
Life time member
Thanks Laitch and Chocolate I am trying some may say very trying.Now all I have to find how to delete an image Cheap and easy master cylinder replacement 694830 Cheap and easy master cylinder replacement Boots_13
Cheap and easy master cylinder replacement Boots_12
Cheap and easy master cylinder replacement Chines22
Cheap and easy master cylinder replacement Chines23
Cheap and easy master cylinder replacement Chines19
Cheap and easy master cylinder replacement Chines21
Cheap and easy master cylinder replacement Chines20

Cheap and easy master cylinder replacement Chines22
Cheap and easy master cylinder replacement Chines23
Cheap and easy master cylinder replacement Chines19
Cheap and easy master cylinder replacement Chines21
Cheap and easy master cylinder replacement Chines20
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Cheap and easy master cylinder replacement Chines25
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Cheap and easy master cylinder replacement Chines28
Cheap and easy master cylinder replacement Boot_r11



Last edited by MartinW on Thu May 18, 2017 5:58 pm; edited 2 times in total (Reason for editing : Redo pictures)

    

Gaz

Gaz
Life time member
Life time member
roundel Now I can see the pictures, thanks.

If you go back in to edit your post, in the edit pane just put your cursor behind the photo you want to delete and backspace it out, then immediately hit the preview button and it will save your change, repeat as necessary. At least that is how I do it.
I need to use the preview button a lot before I send to tidy up my spelling and my tablet's auto correction.
Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

MartinW

MartinW
Life time member
Life time member
Thanks fellas for the welcome glad to contribute, as a new member I might not be able to remove pictures. I  tried your method Gaz and I can't lock the cursor in behind. Maybe one of your nice forum facilitators will clean up my mess otherwise I'll wait until my daughter visits.
Regards Martin.

    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@MartinW wrote:...as a new member I might not be able to remove pictures. Maybe one of your nice forum facilitators will clean up my mess...
Regards Martin.
Done.
cheers

PS, just click 'edit', when you see the empty box where the image should be, press 'backspace', repeat until ghost images are toast, then 'send' to save your work. What Gaz said.


__________________________________________________

Sometimes I lie awake at night, and I ask, "What can I do to keep my life from going by so fast?" Then a voice comes to me that says, "Try slowing down at the corners." 

~Charlie Brown

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

MartinW

MartinW
Life time member
Life time member
Thanks TWB I've tried a couple of times when my daughter visits i''ll get her to have a look.
regards Martin.

    

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