[f.monroe]

There are lots of little high spots in the brake lines going to the rear brakes. Yo umay want to try to bleed it at the high spots first . Bleed it at the master cyl, at the rear of the truck where it leaves the frame and goes downward to the rear axle ,at the T fitting that splits the line a tthe diff and runs to the driver and passenger side, then finally at the drum brake cylinders . It will take a bit of doing to get the air out . I have also jacked the rear up as high as possible and supported it with jack stands to bleed brakes. Air will travel up hill and you can direct it to where you want it to go . Jacking up one side at a time will also direct it to that wheel cylinder for bleeding purposes . I have found that bleeding new brake lines is a time consuming procedure with out a pressure bleeder t oforce fluid through the system . Keep at it and you will get it .
Frank