BMW K bikes (Bricks)


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Bonzo

Bonzo
Life time member
Life time member
My front master cylinder is leaking and I'd rather not spend over £300 on a new one if I can avoid it.

Long shot, but has anyone got a used spare sat on their shelf that they'd like to swap for some money?  cheers


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1990 K100RS 4V (VIN# 6406682)
2017 R1200RS SE Sport
    

Rick G

Rick G
admin
admin
Not easy to find one of those. I recently got a stainless sleeve inserted then bored to 19mm or 3/4in And had a piston made then next time its easy because all you need is a seal replacement.  Many clutch and brake repair places can do it, you may need to ask around as some will say no they cant do it. Cost me $200AU and was a lot cheaper than a new OEM if they have them.
This may help
https://www.aliexpress.com/item/1005003064759772.html?spm=a2g0o.productlist.0.0.4e61bacb1RKXUn&algo_pvid=7b3cd171-ed01-492e-b62e-76fcb6d401d0&algo_exp_id=7b3cd171-ed01-492e-b62e-76fcb6d401d0-30&pdp_ext_f=%7B%22sku_id%22%3A%2212000023730995067%22%7D&pdp_npi=2%40dis%21AUD%21%2111.18%21%21%21%21%21%402103255a16576784702596646ea381%2112000023730995067%21sea


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"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 1999 K1100 LT with a Big Block 1200
    

Bonzo

Bonzo
Life time member
Life time member
Cheers Rick,

Hopefully at the weekend I can find some time and investigate exactly where the leak is coming from so I have a better understanding of what it needs  Front master cylinder for '90 K100RS 16v. 112350


__________________________________________________
1990 K100RS 4V (VIN# 6406682)
2017 R1200RS SE Sport
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Be sure to also replace the external, cylindrical rubber boot on the 16V master cylinder. It deteriorates and often is the "cause" of the internal seal leaking due to debris buildup, as it faces the world's crap in an oncoming rush.
Front master cylinder for '90 K100RS 16v. 20mmmc10
BMW part number 32 72 2 310 756. The 'Bins, Sherlock or others may also stock it in your part of the world. #8 is the one.

It's been my experience with the 20mm M/C version that they're often scored in the bore beyond rebuildability (is that an actual word?!). Even though there's a piston and seal kit readily available. You can see it in the image as #20. But, sometimes we get lucky and you're able to get it to seal...


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1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

Bonzo

Bonzo
Life time member
Life time member
Two Wheels Better wrote:Be sure to also replace the external, cylindrical rubber boot on the 16V master cylinder. It deteriorates and often is the "cause" of the internal seal leaking due to debris buildup, as it faces the world's crap in an oncoming rush.
Front master cylinder for '90 K100RS 16v. 20mmmc10
BMW part number 32 72 2 310 756. The 'Bins, Sherlock or others may also stock it in your part of the world. #8 is the one.

It's been my experience with the 20mm M/C version that they're often scored in the bore beyond rebuildability (is that an actual word?!). Even though there's a piston and seal kit readily available. You can see it in the image as #20. But, sometimes we get lucky and you're able to get it to seal...

Thanks TWB  Front master cylinder for '90 K100RS 16v. 112350


__________________________________________________
1990 K100RS 4V (VIN# 6406682)
2017 R1200RS SE Sport
    

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