My brake issue discovered..

This problem took a bit of finding. I only discovered it when I added fluid to the brake system, the fluid worked its way through the whole system but the right hand brakes would not work. I tracked it back through part by part until only the elbow could be the issue. I must admit I couldn't imagine how this was until I removed it from the brake cylinder and discovered that a stray rivet had somehow got into the fitting. A messy but successful bit of snagging.

Wow! Good sleuthing. Flat or round head?

And, hopefully the rivet is still usable. You don't want to waste them!

Good sleuthing indeed. Who woulda thunk?

NASA tests show that brake fluid has no negative affect on rivet function. Rivet saved!

It was a flat head. Tried to post a pic but foiled by Android.

Rivet was saved but hydraulic fluid was tragically lost....