This is a simple way to bleed brakes. Most master cylinders are located somewhere above the caliper or wheel cylinder and bleeding can sometimes be a real pain. If you have ever changed a brake hose, master cylinder, wheel cylinder or caliper you may have had air become trapped somewhere in the system. Since most master cylinders only move a small amount of fluid, the air in the system will simply stay trapped. Also air being lighter than the fluid wants to move up in the line not down so I use a new lever type oil can with 3/16" piece of fuel line about 18" long attached with a hose clamp. Attach the other end to the brake bleeder. Empty the master cylinder. Fill the can with clean fresh brake fluid, open the bleeder 1/2 to 1 turn and bleed brakes in reverse from the bleeder up into the master cylinder. Keep an eye on the master cylinder that you dont over fill it as brake fluid can raise hell with painted surfaces. When the master cylinder is full, close bleeder and check brake lever or pedal feel. You should have good brake pressure at this time. The reason I specify a new lever type oil can is that any oil can previously used for oil will contaminate your brake system........ BG