Bobbed Deuce, missing air brake lines

[sandcobra164]

When I had an M105 trailer, the air lines and tank were missing. I ran an airline straight to the airpack and connected it to the driver's side "Service" gladhand. The trailer would lock the wheels under rather mild application of the brake pedal so I never used them again. My stopping distances never really seemed to change whether the trailer was attached or not.

 

[clinto]

I recently went thought this.

Friend's bobbed deuce had the rear brake line capped and both of the rear air lines capped. People are lazy.

He asked me to fix it.

Remove the bed



Service is the drivers side, emergency is the right. They use different size pipe, one is larger than the other.




I didn't have any of the factory pipe hardware, so I used generic hardware store stuff, as I felt originality on a truck that's been bobbed was a moot point.

 

[rosco]

The M105A2 is considered "air over hydraulic" braking system. It meets the "break-away specifications". It has its own air storage tank & a relay emergency valve that enables it to do that, when its connected to the standard Service & Emergency air lines found on a Deuce & other air braking vehicles. The earlier M105 trailers do not!

Tinkering, modifying, adulteration or disabling the brake systems of highway vehicles should not be considered lightly, much less optional, especially when many in the Hobby don't have a clue how the system works. Everything is in the TM's, but few make the effort to learn. At least a CDL requires a basic minimum understanding of brakes & safety!

 

[sandcobra164]

I came up with my "solution" to the missing air tank problem after studying an M105A1 trailer. As you pointed out, they do not have a "break away" system. I connected my air line in the same manner. I posted a thread on here concerning my locking of the wheels issue to no avail. I had considered perhaps installing a pressure regulator as well as adjusting the brake shoes "a little loose" to try and prevent this issue. In the end though, I ran with no trailer brakes. I took into consideration that many people pull them around with 1/2 ton pickup trucks with no mentioned issues that I've read on here at much higher speeds than my Deuce was capable of. I also thought about the added weight on the Deuces stock brake system but remembered that Shop Van variants weigh more than a Deuce Cargo and M105 trailer combined with the same braking system. I found all of the information in the TM's and from reading various threads on here when considering my decision.

 

[porkysplace]

I came up with my "solution" to the missing air tank problem after studying an M105A1 trailer. As you pointed out, they do not have a "break away" system. I connected my air line in the same manner. I posted a thread on here concerning my locking of the wheels issue to no avail. I had considered perhaps installing a pressure regulator as well as adjusting the brake shoes "a little loose" to try and prevent this issue. In the end though, I ran with no trailer brakes. I took into consideration that many people pull them around with 1/2 ton pickup trucks with no mentioned issues that I've read on here at much higher speeds than my Deuce was capable of. I also thought about the added weight on the Deuces stock brake system but remembered that Shop Van variants weigh more than a Deuce Cargo and M105 trailer combined with the same braking system. I found all of the information in the TM's and from reading various threads on here when considering my decision.

But a majority of states require trailer brakes on trailers with a GVWR of #3000 or more

http://www.towshop.com/trailer_supplemental_braking_laws.htm

Weight Limits for Towing without Supplemental Brakes (Source: American Automobile Association Digest of Motor Laws, 2008 Edition)

Alabama.​	3,000​	Kentucky​	3,000	North Dakota	3,000	Alberta	2,000
Alaska​	5,000	Louisiana​	3,000	Ohio	2,000	British Columbia	3,080
Arizona​	3,000	Maine​	3,000	Oklahoma	3,000	Manitoba	'A'
Arkansas​	3,000	Maryland​	3,000	Oregon	‘A’	New Brunswick	3,000
California​	1,500	Massachusetts​	10,000	Pennsylvania	3,000	Newfoundland	‘A’
Colorado​	3,000	Michigan​	3,000	Rhode Island	4,000	Northwest Territories	'C'
Connecticut​	3,000	Minnesota​	3,000	South Carolina	3,000	Nova Scotia	4,000
Delaware​	4,000	Mississippi​	2,000	South Dakota	3,000	Ontario	3,000
D.C​	3,000	Missouri​	‘B’	Tennessee	3,000	Prince Edward Island	3,300
Florida​	3,000	Montana​	3,000	Texas	4,500	Quebec	2,860
Georgia​	3,000	Nebraska​	3,000	Utah	2,000	Saskatchewan	3,000
Hawaii​	3,000	Nevada​	1,500	Vermont	3,000	Yukon Territory	2,000
Idaho​	1,500	New Hampshire​	3,000	Virginia	3,000
Illinois​	3,000	New Jersey​	3,000	Washington	3,000
Indiana	3,000	New Mexico	3,000	West Virginia	3,000
Iowa​	3,000	New York​	1,000	Wisconsin	3,000
Kansas​	'A'	North Carolina ​	4,000	Wyoming	'A'

 

[tobyS]

I would put a flow control in the line so it would meter the amount going out to the brakes and be free flow return.

 

[sandcobra164]

Might work, I haven't had that trailer in over 2 years so I don't have a way to try it. I was just posting what my observations were. I never said running without the brakes functioning was correct, I was merely posting what my experiences were. I have an M1102 with functioning surge brakes now.

 

[gentrysgarage]

Does anybody know what the air pressure is at the glad hands at full braking? Only found the holding test of 60 psi for 5 minutes in the M105A2 TM.
Thanks!

 

[sandcobra164]

Emergency side should be consistent with gauge reading so 120 psi for a fully working air system. Brake pressure on the service line will depend on the amount of pressure exerted upon the brake pedal and the sensing valve in the air pack. Here is where people need to really understand the design of the deuce brake system. The pedal moves the master cylinder, that sends hydraulic pressure to the airpack, the airpack has a sensing valve that sends air pressure to the back side or "J" pipe of the "assist piston" and it increases the hydraulic pressure exerted in the wheel cylinders. Brakes apply according to pedal pressure. People that set up a deuce for towing tap into the "J" pipe to apply air pressure to the air pack booster and make it apply hydraulic pressure to the wheel cylinders. At full pedal pressure, I would think it would be the same 120 psi being exerted on the service line.

That's my understanding, I may have gotten it wrong. I no longer own that truck either but I really did love it! I'll add a few pictures. My boys helped me get the brake system working properly 2 days before a Rally. PMCS doesn't involve pushing the bellows but reading here did. Master Cylinder was leaking.

 

[tobyS]

It wouldn't take much to put a gauge onto a glad hand and try it. Well maybe... a running truck...and soldier 2.