Drum brakes don't work

[Marshall]

should have no effect on the cylinder, do you get fluid coming out when bleeding the rear cylinders? Are those original, cylinders will rust up inside and jam up if not used for a long time.
Pull the rubber back and look at the pistons, see rust?, They look good in the pictures.
In the old days we had cylinder hones to clean them up, but now just buy new ones.

With the wheels on and tires off the ground, easy way is have some on push the brake peddle and see if the wheel locks up when you turn it. if it don't , cylinders are seized or line is plugged,
What does the peddle feel like? not soft or hitting the floor?

 

[Marshall]

Reading your first post, sounds like you put new cylinders on the rear drums? If so may still have air in the system, but if that's the case , the brake peddle would hit the floor.

What where they like before you started working on these? sounds like they where dragging?
I may have missed that post.

 

[David Vandercook]

On vacation right now so I can't take a look at it. Before I left I looked over it with a mechanic and he suggested blowing out the lines and replacing the master cylinder so I think I'll probably start with that since the wheel cylinders appear to be doing nothing. I'll update if that doesn't wind up working. Thanks for the help

 

[u2slow]

Start with the prop valve before the master. Jmho.

 

[Dodge 1500 4X4]

Start with the prop valve before the master. Jmho.

If the proportioning valve is bad you will no flow to the rear brakes.

 

[David Vandercook]

I do have flow to the brakes because I was able to bleed them. It wasn't strong flow though. Kind of a dribbling stream, not high pressure. The brake pedal feels a little bit inconsistent and scratchy so I suspect a master cylinder issue.

 

[u2slow]

I do have flow to the brakes because I was able to bleed them. It wasn't strong flow though. Kind of a dribbling stream, not high pressure. The brake pedal feels a little bit inconsistent and scratchy so I suspect a master cylinder issue.

I was able to bleed mine too, but it struggled to stop the rear wheels while running the truck on jackstands. It was the prop valve for me. Ymmv.

 

[Dodge 1500 4X4]

was able to bleed mine too, but it struggled to stop the rear wheels while running the truck on jackstands. It was the prop valve for me. Ymmv.

Same thing with me, they are supposed to give 75% fluid to the front brakes and 25% to the rear brakes, in ideal situation vehicles, currently it's more like 50/50 because of all the all-wheel drive and 4-wheel drive.

 

[bigblock_doc]

View attachment 543810

shoes on backwards.