Went to track day. Progressively lever lost feel and finally pulled back to bar.
Bled brakes with me mityvac. Went fine but no change. Bloke came along and seemed to open the bleed nipple very slightly, pull back the lever, close the nipple. He repeated this about 20 times. Result rock hard brake lever for rest of day.
Can anyone confirm what he was doing and why it made the difference it did?
I did not watch closely enough...git.
