alot of the plastic units do not have bleeders.

you fill it at an angle, make sure the master is full, make sure the line is as full as you can get it. Hook everything up and slave installed.
You'll need two people for this one.....
one person under the hood with plenty of fluid, and you need to get under the vehicle.
Get enough clearance to get under the vehicle, and with some sort of pry bar push the slave to fully retracted (slowly as possible) this will force fluid out of the master, so expect it.
As you release make sure the person up top is keeping the master full.
Repeat this procedure 10-20 times or until air stops bubbling out of the master.

go for a drive and work out the rest of the air if any.
I've done this hundred of times on cars and trucks.
Drew