racer38 wrote:Because the m/c banjo is a high point in the system, I’ve found you get a little air bubble trapped in it over time. Quite often I’d lean the bike right over to the left side when sat on it and these bubbles would make their way up the m/c and in to reservoir.

"I'm bleeding my master cylinder officer, thats why I had my knee down honest!"
"And the wheelie was to help bleed up the rad!"

_

Lesson for us all there Racer, keep a regular service eye on your stoppers!!