Brakes Draining air tanks

[w3azel]

So I just changed my rear axle to a single for my crew cab build. Built a power bleeder and did the whole system no issue till I drove the truck. When I hold the brakes the air system drains. Found a small leak in the system, fixed it re-bled the system but still nothing. I can press the brakes and watch the pressure drop from 90-60 in 4 sec all the way to 30 and then it holds. The brakes don't give out though and its not emptying the master cylinder.

 

[porkysplace]

Are the air valves for the trailer brakes closed ?

 

[gimpyrobb]

Did you modify the air lines that go to the back of the truck at all?

A guy I know had his deuce turned into a bobbed deuce and the company that did the conversion actually hooked the "service" line into the "emergency" line!

 

[welldigger]

If it isn't an air line issue I would look at the air pak.

 

[w3azel]

O now I feel like an idiot. Trailer brake air valve was turned on. I thought perpendicular would be off but I guess it has to be parallel. For some reason I didn't mess with the emergency line. Thanks guys, I was about to rip into the air pack cause I couldn't find where the hissing was coming from.

 

[Jeepsinker]

That's how I felt when I first got my truck. Was trying to put air in my tires with a gladhand air hose and had it connected to the service gladhand instead of the emergency gladhand. Kept wondering why I could hear air moving when I pushed the chuck onto the valve stem but the tire pressure was getting lower every time I checked it. We all have our moments.

 

[swbradley1]

I am pretty sure that this is the first time that has EVER happened to anyone on this site.


(Two weeks ago.....)

 

[Jeepsinker]

Well, some people flop deuces on their side, and some of us accidentally drain tires. I suppose that I've made my mark here now. Hahaha.

 

[Dipstick]

Well, some people flop deuces on their side, and some of us accidentally drain tires. I suppose that I've made my mark here now. Hahaha.

And some amongst us sink jeeps! Reminds me of the time I was sitting embarrassed in the middle of a parking lot with a non-moveable truck thinking my clutch had gone south. Then, I realized I had inadvertently bumped the transfer case handle into neutral. What a relief that was.

 

[prep 1355]

What kind of brake fluid do I put in the do some have master cylinder when I bleed it What is compatible with the military brake fluid

 

[welldigger]

What kind of brake fluid do I put in the do some have master cylinder when I bleed it What is compatible with the military brake fluid

Dot 5 in most cases. Test a sample first to be sure.

 

[porkysplace]

What kind of brake fluid do I put in the do some have master cylinder when I bleed it What is compatible with the military brake fluid

Two threads related to your question ;
1. Brake fluid -how to tell which kind you have DOT 3 or DOT 5 how to determine which brake fluid you have .
2.Deuce Power Bleeder R4x4 Style step by step on how to build a power bleeder.

 

[swbradley1]

I am pretty sure that this is the first time that has EVER happened to anyone on this site.


(Two weeks ago.....)

And again today!! What the heck. I suddenly forget everything because I have driven the truck in a month? Doh!!

 

[silverstate55]

What kind of brake fluid do I put in the do some have master cylinder when I bleed it What is compatible with the military brake fluid

Beware of DOT 5.1; use only DOT 5 (silicone brake fluid). 5 & 5.1 are NOT the same! Just read an article on one of my Dodge Cummins sites, 5.1 is approved for Dodge trucks as it interchanges with DOT 3 & 4 with a higher boiling point than either of those (of course you want to flush out the old stuff completely, not advisable to mix different grades).

I've mixed off-the-shelf NAPA DOT-5 silicone brake fluid with the leftover military surplus BFS; it all turns the same color when mixed together and works great. You can tell when water/moisture gets into it when bleeding your brakes, the moisture will be the black droplets that fall to the bottom of the bleeding canister.