Fr br master cylinder

  • martin_csr
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Fr br master cylinder

20 Oct 2017 11:34
#773340
1981 KZ650-CSR w single disk front brake & stock Fr master cylinder.

I'm refurbishing the Fr br master cylinder. It wasn't leaking prior to removing it from the bike. When I removed the piston liner & dust cover, there was what looked like crusty brake fluid residue. not much. I'm assuming a little buildup over time would be normal from the normal action of the piston's movement. Would that be a reasonable assumption?

AFAIK, a new piston assy kit isn't available for the 650-CSR. neither oem or aftermarket. The 650-B2/B3 piston assy appears to be a very close match, so I may try that kit if mine leaks.

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  • Nessism
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Re: Fr br master cylinder

20 Oct 2017 12:49
#773352
That film sounds normal. That said, I'd try to find a new seal for the plunger and maybe a new dust boot too if possible. 35 year old rubber parts should be replaced when possible.

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Re: Fr br master cylinder

20 Oct 2017 13:34 - 21 Oct 2017 07:36
#773354
The brake was working fine, but the paint was messed up around the reservoir cap. I was thinking that by disassembling & cleaning it, that the piston might start leaking. I guess I'll find out soon enough. hee. I'm not sure if the earlier 650 kit will work & didn't want to risk wasting money yet. I'm expecting to install a Honda master cylinder anyway, but I wanted to see if my refurbishing stuff worked on the stock unit. Thanks.
Last edit: 21 Oct 2017 07:36 by martin_csr.

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