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Dot 5 turns yellow with age. That doesn't mean that's what's in there but you can't go by color.

Thats exactly my point. When you bleed the system with dot 5 the moisture stays on the bottom of the wheel cylinders. With dot 3/4 the moisture is in solution with the brake fluid. So a system flush draws out most of the moisture.

I agree. I'm not a huge fan of dot 5. I have seen plenty of totally destroyed wheel cylinders and master cylinders because condensation sat on the bottom of them and caused major rust damage while using dot 5. Not to mention brake systems with dot 5 can be infuriating to bleed since the brake...

Dot 5 can be found at Napa for around 35 bucks for 32oz. If you had to bleed the air pak then yes you must bleed each wheel also. This way you get fresh clean fluid to each wheel and get the air out. Start at the furthest away wheel from the Mc. This would be the rear passenger side wheel...

O and simple test for brake fluid is pour some brake fluid into an empty water bottle. Then add some water and shake. If you have dot 5 it will separate out and float on top after a while. If you have dot 3 or 4 then they won't separate since dot 3 and 4 absorb water.

If you haven't already build a pressure bleeder. There's a thread about it in the stickies. Well worth the 40 or so dollars to have one. Then once you have your pressure bleeder hook it up empty to the master cylinder. Pressurize the brake system and salvage some fluid from a wheel cylinder...

Dot 5 turns amber very soon after being added to the system. DO NOT add dot 3 until you are sure what is in your truck. Dot 3 and dot 5 combined will gel and possibly cause brake failure. More than likely you have dot 5. But siphon some out and add some dot 3 and see what happens.