Honda Shadow Front Brake Fail

After rebuilding the front brake caliper on my 1986 Honda Shadow VT700C, I decided to take it out for a ride. I drove a couple miles out and decided to head back to the house. On the way back, I noticed the front brake was starting to drag again. I concluded that the master cylinder must be failing. I made it back home but before I got back into the garage, this happened. I hope that you enjoy. Thank you.