The last truck I had to bleed the brakes on I had to use a vacuum pump to suck the fluid through the system. I tried every other way, and nothing else worked. I had to borrow a vacuum pump.

That process took about 20 minutes. You fill the master, hook the pump to the bleeder screw open it and pump the pump until the fluid flows without air. It took a couple minutes with the farthest bleeder from the master, but each one after took less. Be sure to refill the master after each bleed. One time at all 4 bleeders and I was done! Didn't trip the proportioning valve or anything. Guess how I'm going to bleed brakes from now on...Gene