R80 G/S master cylinder

SteveHop · Jul 13, 2021

I noticed that with the bike on the center stand -
- if the handlebars are turned to the left i get a "drip" of brake fluid on the underside of the master cylinder.
- if i turn the bars to the right no leak ?

Ive check it a couple of times and can't make it out ?

Not sure if its worth getting a master cylinder rebuild kit ? Or can i just replace the seals ?
Thought i would just change the resovoir O ring first although im not sure if that would solve .

Any ideas ?

Thx

theoneandonly · Jul 13, 2021

stressing the hose ?

scooter paul · Jul 13, 2021

Without stating the obvious, there should never be any leak. I’d get a new piston kit with seals installed ( I’m not sure if you can buy the seals on their own anymore), new reservoir seal and if need be a new hose and washer.
I like the Venhill engineering ‘ build a hose’ option from their website. Using the black hose and black fittings I think it looks good. Not too snazzy and not too ‘custom’.

Nin · Jul 13, 2021

I couldn’t find just seals so bought a full piston kit from Motorworks. Dead easy to change, just make sure you get the correct diameter.

SteveHop · Jul 13, 2021

Nin said:
I couldn’t find just seals so bought a full piston kit from Motorworks. Dead easy to change, just make sure you get the correct diameter.

Ill take it apart and have a look at the condition of the bore.
Hope piston kit is the way to go.
Thx

R80 G/S master cylinder

SteveHop

Well-known member

theoneandonly

looking over the edge

scooter paul

Well-known member

Nin

Well-known member

SteveHop

Well-known member

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