Brake master cylinder diaphragm busing

[aquamantx]

Ok so cleaning up rear master. have the new kit for the innards but as we all know there is always something not available. Some guidance on the plate/busing that sits under the diaphragm. Super important, or just shape holder for the diaphragm? mines a little crusty and have cleaned. Should I just smooth out with a skim coat of jb weld or does someone have a source.

[DEEBS11]

No new parts available. This used unit can be cleaned up.


https://www.ebay.com/itm/11622730739...Bk9SR4SC5J6mZQ

[aquamantx]

Appreciate the find. Mine was pretty crusty under the rubber but the rubber is still good. keep it for back up..

[LAB3]

Remember, it's the rubber that does the sealing not the bushing. I'd just clean it up and use it as is.

[Radioguylogs]

I'm with LAB3. I usually just hit them with a wire wheel and reuse them.

I think JB Weld is asking for trouble being uneven and susceptible to chemicals.

I'd pick POR15 if anything.

[jetmechmarty]

I'm with LAB3. I usually just hit them with a wire wheel and reuse them.


I'd pick POR15 if anything.

I believe POR15 is solvent based. Zinc plate it.

[Radioguylogs]

I believe POR15 is solvent based. Zinc plate it.

No solvent will dissolve POR15.

Zinc plating is better if you can manage it.

[cajun31]

Just wanted to throw this out there Yambits : Master Cylinder Parts for Yamaha XS1100 1978-1980