Brake issue and two additional questions

[lebicicletta]

Greetings, all. I've been enjoying my new to me R65 all summer, but have encountered a problem with my front disk brakes (ATE). New M/C and rebuilt calipers, stainless steel brake lines over the winter, all functioning fine till this week when fluid level has dropped maybe a quarter inch and brake lever occasionally gets a little "floppy" after use until it retuns to normal (usually a few seconds later). No obvious leaks evident.  Possibly bleed system and???

Second, can you recommend a windscreen? I see several available, but worry about fit issues.  

Finally, a recommendation on a tank bag?

Thanks all!

[montmil]

Simple things first, Bleed the system. Afterwards, tie back the brake lever and leave it overnight. That will force the last of Don Ho's "Tiny Bubbles" outta the system.
I have an economical magnetic tank bag that swaps between all the bikes. You can go economy, mid-price or spend way too much. Google up and plan to stay awhile.