If you have one of those problem brake systems that you just can't get bled properly, try this before you loose your mind.
After you have bled the calipers good, turn the bars all the way left, then tie your brake lever in the "squeezed" position with a bungee cord or something to hold the handle to the bar, fill the master cylinder and go to bed.
In the morning before you release the lever, tap around the outside of the cylinder and line with a hammer handle or plastic head hammer and watch inside the cylinder at the bubbles that come up in the fluid , test your brakes and make sure all is OK . Usually removes any trapped air in the system.
It's best to replace the cover overnight to avoid any contamination of the fluid chamber. You will usually see the bubbles rise out of the brake fluid as you tap the cylinder.
A few other links to add to this procedure for more input.
Hydraulics Bleeding (Brake and Clutch)
Greenberg Brake Bleeding Method
After you have bled the calipers good, turn the bars all the way left, then tie your brake lever in the "squeezed" position with a bungee cord or something to hold the handle to the bar, fill the master cylinder and go to bed.
In the morning before you release the lever, tap around the outside of the cylinder and line with a hammer handle or plastic head hammer and watch inside the cylinder at the bubbles that come up in the fluid , test your brakes and make sure all is OK . Usually removes any trapped air in the system.
It's best to replace the cover overnight to avoid any contamination of the fluid chamber. You will usually see the bubbles rise out of the brake fluid as you tap the cylinder.
A few other links to add to this procedure for more input.
Hydraulics Bleeding (Brake and Clutch)
Greenberg Brake Bleeding Method