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Hey Aaron. Do you happen to have the manufacturer and part number for the A2 Master Cylinder rebuild kit ? I tried to get the proper 'O' rings for mine but they must be an odd size and what are the 'O' rings made of ? Thanks Aaron.

Yep, defiantly a 1987-88 Air-Force truck. That Master cylinder bracket has the special end for the PTO lever, and those brake lines are factory. As far as bleeding goes, bleed out the left side air-pac (under the master cylinder) first then the right side one. Then you would bleed out the front...

If you have someone to help you that is a perfectly acceptable way of bleeding brakes. Just watch the master cylinder fluid level. It's really easy to blast out all your fluid that way.

Water will not mix with DOT 5 fluid. So if you take some brake fluid out and put a drop of water into it if it puddles up it is DOT 5. If it mixes it is DOT 3 .

Your confusing the "air-pacs" for master cylinders. You will only have "one" master cylinder in any vehicle . That one master cylinder then "feeds" the air-pacs, which depending if you have a single or dual system will be either one or two air-pacs.