19 Tri Glide clutch master cylinder

[Rogue1]

I took the clutch master cylinder off to change my bars and I noticed a drop of fluid on the housing inside the clamp that holds it to the handlebars. I looked at the master cylinder and there's a hole to the right of the screw hole from the clamp that holds it to the bar. It appears to be a molded in hole and when I touch the lever a bit of fluid came out of the hole. Anybody know what I'm talking about and what this might be?

[Rogue1]

I think I figured it out. It must be a vent hole of some sort and when I was rerouting the master cylinder, I had it upside down turned around and it was hanging upside down for a while. And I'm thinking the fluid come out then. I put it back on the handlebars everything works fine no drips no leaks no nothing. If anyone has any other ideas I'd like to hear it.

[Sidecarbill]

No nothing of Harley. But most brake systems don't vent to atmosphere. They are hydroscopic and absorb moisture.

[OLBLU]

If it is like a brake master cylinder, there should be a rubber bellows that covers the fluid and the vent hole allows the bellows to move in and out with pressure changes.

I don't know how this helps ,but since they are designed this way, there must be a reason.

[Rogue1]

The next time someone takes their clutch master cylinder off have a look-see. The hole is just to the right of the top screw hole for the clamp that holds it on the handlebar

[Koolbreeze]

The next time someone takes their clutch master cylinder off have a look-see. The hole is just to the right of the top screw hole for the clamp that holds it on the handlebar

You are correct, the little hole is to allow the gasket underneath to move down and up depending on how the fluid underneath moves. The gasket consists of a rubber seal and a plastic plate that fits into the rubber seal. I think there is a caution in the FSM about not to turn the clutch or brake master cylinders upside down.

See #15 in image below

[Rogue1]

Thanks.That explains it.

[2K1200LTS]

A couple years ago i went to flush out the brake fluid on a Cam Am and the rubber gaskets for the master cylinder look like someone took a razor and made a cut in them. I order new ones and that's the why they came. So I guess there system is open not sealed.