1951 reo m35 or m59 brake issue.

[Mackafd]

I just picked up a 1951 reo m35 or m59. the owner put a regulator on the air system to lower the psi going to the air pac down to 60psi. he says any more then 60 and the brakes lock up?? this is a new airpac anyone have any ideas???

 

[gimpyrobb]

That sounds very wrong. I guess its time to pull the hubs and see what needs fixed. Sounds to me like you might need new pads or if your lucky alignment pins.

 

[Mackafd]

maybe I am not explaning right. the brakes activate them selfs with out touch the peddle when air is above 60psi

 

[Recovry4x4]

That is a faulty airpack regardless of age. Now, if they start applying after a few stops, that could be other items. If you crank the air above 60 and the brakes apply themselves, that is airpack for sure.

 

[gimpyrobb]

Yup, time for a rebuild or put a newer "shorty" air pack in.

 

[pigpen60]

Why a shorty airpack?

 

[rustystud]

Why a shorty airpack?

The shorty is from the 1980's/90's . It design is modern and uses "silicone seals" . All and all a better unit. I have rebuilt both and the newer shorty style is so much easier to rebuild.

 

[Mackafd]

Ok when I was at the truck yesterday I pulled a sample of brake fluid and placed in a jar it was amber. Then added a little water and got instant milk. Shake it and left for over an HR and still had milk. Now he said he thinks he used dot 3 when he did the wheel cyl and master and installed a new air pak so I think I am good to say continue to use dot 3.

 

[Recovry4x4]

Considering that I would clear all the fluid in the MC and powerbleed/flush the system.

 

[NDT]

Unless the truck recently came from the military or the owner has done a high quality restoration on it, the brake fluid will be DOT 3.

 

[Karl kostman]

MILKY???I have never had that experience when testing brake fluid! What you should get is after you shake it up and let it sit you should get a defined layer of water and a other layer of brake fluid, I have never seen anything MILKY in my test jar? Like recovery4x4 said I would drain and flush the brake system then refill with fresh DOT 3, yes I know its a little more work BUT then you know exactly what your dealing with!
Karl

 

[Mackafd]

trying to post a photo

 

[Mackafd]

photo

 

[topo]

Looks like water on bottom and something on top ? Not knowing anything about this truck I would check all fluids for water and look at the wheel bearings .