Brakes, Airpack not working?

[dlbard]

How much pressure is needed to operate the brakes.? Would you be able to lock up the brakes if you would use hand pressure? I'm thinking my brakes are not working as they should.

 

[HDN]

Single or dual-circuit? I know dual-circuit trucks take a bit more oomph to work the brakes than single-circuit trucks based on feedback I've read here. I say that having never driven a single-circuit deuce before.

I have a hunch that hand pressure wouldn't lock up the brakes on a single-circuit truck.

 

[NDT]

Pedal is hard as a rock with no air. I would say assist starts to become noticeable at 60 psi.

 

[Barrman]

With no air in the system how far does your pedal travel before it stops with firm pressure? There should be around 3 inches left above the floorboard with a properly adjusted and bled system. With no airpack assistance it takes a lot of pressure to stop the truck and even more to lock up the tires.

With the airpack getting air the pedal will probably be a little higher and medium to moderate leg pressure should lock up the tires on dirt.

 

[dlbard]

It is single circuit type.
From memory, I believe the pedal goes down about a third of the way before it gets hard.

 

[WillWagner]

The truck will still stop with no boost, just takes more pedal pressure. The brakes can be bled and work fine if the air pack is stuck, not making pressure assist. Hand pressure will not be enough to stop you. If the air pack is not stuck and the piston inside is working, the brakes will not bleed and/or, if the vent line is still attached, brake fluid will drip, well, flow really, out the blow by tube. and you will push all the fluid out of the system via the blow by tube.

When I first got my turd, it had the normal deuce thing, a dry MC. Had zero idea what the air pack was. I put a new MC on it, bled the brakes and drove it like that for months. I just knew to let off the go pedal and brake early. This was VERY early in the interwebs era. I had an idea that the truck was big enough that it SHOULD have had some sort of assist for braking, but, had zero idea where to start. I decided one day to just push the pedal REAL hard while sitting still in front of the house. When I did that, I heard a pop and air hissing when the pedal was released. After that, the pedal was easy to depress. Drove it around a bit and it was AWESOME! I had power brakes! HOWEVER, when I got home and did my walk around, I found a puddle under the truck, it was from the blow by tube. How does that happen?? This was actually just as Steel Soldiers was transitioning from Chris' CUCV Page. There were only a hand full of people here, but I stumbled across the site and found the answer to my dilemma with the help of Recovery4x4, Steelsoldiers and others. Recovery4x4 was actually the one that noticed the assembly error in the TM for the air pack.

After the air pack rebuild, the truck had solid brakes, used zero fluid and was as reliable as your daily driver up until the time I sold it.

I Do miss it!

 

[dlbard]

The truck will still stop with no boost, just takes more pedal pressure. The brakes can be bled and work fine if the air pack is stuck, not making pressure assist. Hand pressure will not be enough to stop you. If the air pack is not stuck and the piston inside is working, the brakes will not bleed and/or, if the vent line is still attached, brake fluid will drip, well, flow really, out the blow by tube. and you will push all the fluid out of the system via the blow by tube.

When I first got my turd, it had the normal deuce thing, a dry MC. Had zero idea what the air pack was. I put a new MC on it, bled the brakes and drove it like that for months. I just knew to let off the go pedal and brake early. This was VERY early in the interwebs era. I had an idea that the truck was big enough that it SHOULD have had some sort of assist for braking, but, had zero idea where to start. I decided one day to just push the pedal REAL hard while sitting still in front of the house. When I did that, I heard a pop and air hissing when the pedal was released. After that, the pedal was easy to depress. Drove it around a bit and it was AWESOME! I had power brakes! HOWEVER, when I got home and did my walk around, I found a puddle under the truck, it was from the blow by tube. How does that happen?? This was actually just as Steel Soldiers was transitioning from Chris' CUCV Page. There were only a hand full of people here, but I stumbled across the site and found the answer to my dilemma with the help of Recovery4x4, Steelsoldiers and others. Recovery4x4 was actually the one that noticed the assembly error in the TM for the air pack.

After the air pack rebuild, the truck had solid brakes, used zero fluid and was as reliable as your daily driver up until the time I sold it.

I Do miss it!

Thanks for the information. I believe mine is similar to yours. It does break , but I have to put a significant amount of pressure on the pedal. I don't think the air assist is really doing anything at all. I think I may end up pulling the air pack and going through it.

 

[G744]

If the airpak is working, you can hear air bleeding off as you release the pedal from a full pump-up.

G744

 

[dlbard]

If the airpak is working, you can hear air bleeding off as you release the pedal from a full pump-up.

G744

Ok... well that's not happening. I guess I need to go through the air pack. Interesting thing is it looks brand new. It was definitely changed out in recent years.
By the way, I've only owned this truck about nine months.

 

[msgjd]

Ok... well that's not happening. I guess I need to go through the air pack. Interesting thing is it looks brand new. It was definitely changed out in recent years.
By the way, I've only owned this truck about nine months.

1: there is a plumbing plug fitting on the pack, and a deuce pack requires lube inside that location..

2: there's a bunch of talk about lubing the pack on this Site

3: as Will mentioned, sometimes a good hard stomp on the pedal (it's advised not to do while rolling) pops them free , but it's best to get some lube in there first ,, you don't want the pack to seize up in the wrong direction else you're not gonna be able to move the truck until you crack open a bleeder

4: keep in mind that you might discover a compromised brake line or hose(s) if stomping on the pedal at full air pressure and having the pack finally "brake" loose (pun intended)

5: had the same issue with my M49A2C when i rescued it from the forest service.. made sure the lube was at proper level in the pack (it was practically empty) and kept working the brakes anytime i used the truck (off-road) .. Then as Will expressed, one day i just happened to push the pedal and it broke free and exhaled the magic sound of goodness.. It's been fine ever since

 

[dlbard]

1: there is a plumbing plug fitting on the pack, and a deuce pack requires lube inside that location..

2: there's a bunch of talk about lubing the pack on this Site

3: as Will mentioned, sometimes a good hard stomp on the pedal (it's advised not to do while rolling) pops them free , but it's best to get some lube in there first ,, you don't want the pack to seize up in the wrong direction else you're not gonna be able to move the truck until you crack open a bleeder

4: keep in mind that you might discover a compromised brake line or hose(s) if stomping on the pedal at full air pressure and having the pack finally "brake" loose (pun intended)

5: had the same issue with my M49A2C when i rescued it from the forest service.. made sure the lube was at proper level in the pack (it was practically empty) and kept working the brakes anytime i used the truck (off-road) .. Then as Will expressed, one day i just happened to push the pedal and it broke free and exhaled the magic sound of goodness.. It's been fine ever since

I remember reading about adding lube. I will try that. I think the last guy who owned it didn't drive it much. I've already driven it around 600 miles in the 9 months I've owned it.