Help - Bleeding brake system with "3rd Chamber"

I have a 2005 Double Cab LTD without VSC. I noticed brake fluid loss and traced it to the master cylinder leaking into the booster. My truck has the odd 2-piece master cylinder with the 2nd piece being referred to as the “unicorn” piece in other threads here. I order the part number that was the complete master and booster assembly. So now I have a very expensive but correct brand-new OE master and booster.

I have a question on understanding the FSM instructions on bleeding the system. I’ve attached the FSM instructions for reverence.

1. The notice says to bleed air from the chassis, 3rd chamber, and chassis again, in that order. Does this mean that I would first bleed all four wheels, then bleed the master, and then bleed all four wheels again?
   
   
2. Section C-2 says to connect the vinyl tube to the master cylinder and the brake caliper or wheel cylinder bleed plug.
   I assume based on the images this means two separate bleeder bottles. One on the master and one on any of the four wheels?
   
   
3. Section C-3 says to open the brake caliper or wheel cylinder bleed plug.
   It seems odd that you would perform the master bleeding steps that follow with one of the wheel bleeders open. I just want to verify this is the case.

Has anyone done one of these or knows well enough to confirm or correct my assumptions?

 

I did the master & booster replacement. For those with a double cab that has the oddball 2-piece master cylinder part # 47200-0C073 is the correct part. It gets you the complete cylinder assembly with booster. I'm pretty sure this is the only way to get it.

So ultimately everything went smoothly and the brakes feel great. I guess the moral is to just follow the FSM step by step and not second guess it.

 

So no bench bleed?

 

As far as bench bleed, my 2005 sr5 DC without the vsc add-on CANNOT be bench bled. This is the first thread I’m visiting, but the new master cylinder, which will mount into the smaller, separate master cylinder’s piece that affixes to the booster (has bleed screw in top), has five weep holes next to the three O rings that slide into the mount. All the fluid will ooze out of those holes. My guess (?) is that it’s a way to collect any seepage past piston to recycle/ suck it back into reservoir somehow since leakage into booster seems to be a complaint for some. I called the online tech at Autozone to confirm this fir part # NM55666.
Notice the diagrams above show two different types of master cylinder, with the fatter one being mine. Doesn’t inspire confidence.