Is there a nozzle on the brake master cylinder to be bled? I bled the rear brakes, and will still bleed the front, but my boss was telling me I might need to bleed the master cylinder itself... Anyone??

 

Bleeding the master is only done when it is replaced.
Short hoses are connected to the ports in place of the brake lines and run back into the reservoirs.

 

Would I need to bleed it if my lines had a break in them though? I leaked a lot of fluid out of my rear passenger brake.

 

Sometimes there is a port for bleeding but usually you break the line nut to release the air.
As stated by OTR tech, the Master usually only need bleeding when replaced and that is first done on the bench before install or if run completely dry of fluid.
If you are doing bleeding yourself get a Vac Pump Kit for bleeding the brake and do it from the bottom making sure to keep the master filled.
AND Start from the furthest away cylinder and more closer.

Sorry if this wasn’t what you needed to hear.