87 b2000 brakes problem

hi can any one help me with the brakes . I've bled them over and over and can only seem to get the left rear brake to work .any ideas?

There's separate circuit for front brakes, and a separate circuit for the rear brakes.

I need to ask if you just replaced or did something and this occurred, or if it happened all by itself.

OK, for the rears. Yes, you found there's only one bleeder valve for the rear brakes. I think you need to manually adjust the rear brakes and then re-bleed the rears.

If the fronts also have no braking, are you getting fluid out the front bleed screws (one on each side)?

i changed the front calipers . yes i am getting fluid out of the fronts . i didn't touch any thing on the rear apart from clamping the soft lines. the clamps were on for a couple of months

When I removed my front brake lines to do other work, I had problems bleeding the front brakes. Both of my bleeders were siezed, so I had to bleed by loosening off the brake hose banjo at the caliper. But to bleed properly, I had to orient the caliper so that the banjo bolt was at the top of the piston, and I used a piece of wood or something to keep the caliper from closing (to simulate a brake rotor), once I got the air out, I put it back on, required some pumping to get the pads to touch the rotor, and its been good since. I am not sure if the bleeders are right on the top of the pistons though.

Why did you have to change calipers in the first place? Maybe you are having master cylinder issues?

i changed the calipers when i put drop spindles in it they were already bolted on to the hub so i just put them in . and i have put a new master cylinder in already and have new wheel cylinders which i got today and will put in tonight

Or your soft lines have stayed "closed" from being clamped for so long. And remember to adjust the rear brakes manually.