I recently got air ingress in one of my rear lines after a job I did on the rear hub. I needed to bleed out the line and remove that nasty air since my Brakes became useless as a result.
Bleeding brake lines is easy and can be done by one person. My method is common and uses little new brake fluid and is pretty fast.
Any container of brake fluid you use must be totally used or you can safely dispose of the remainder. Do not reuse left over brake fluid as this will absorb moisture over time and compromise your brake system!
When bleeding all four lines please consult your car's service manual to tell you which order of wheels to operate. Mines is RR, FL, RL then FR.
Step 1: Connect Tubing and Collection Container.
You must start your engine since the brake master cylinder needs the vacuum pull of the engine to make the hydraulics work.
Take a piece of steel or wood and use it to wedge the brake pedal down as far as u can. Next open the bleed nipple but you don't have to open it all the way, just a crack will do. You will see fluid come out. You can leave the spanner on it.
(An alternate and faster way to bleed any brake line is to have a person assist you. Let them pump the brakes pedal several times then mash it down. You would simply open a previously closed bleeder valve to let air and fluid out then close it shut. You can repeat this process as many times as you wish for the same brake line).