2000 Chevrolet silverado?

[Rita]

change brake line on back can not get the fluid to go to the back wheel
there are no kink or resticter
The brake line was leaking,it had a hole in it.

 

[matt m]

the shuttle valve in the proportioning valve may have moved to the rear blocking passage, try bleeding front brakes to get shuttle valve to move back to center

 

[landie_man88]

You just need to pump more fluid through. Make sure the reservoir doesn't empty and get a helper to sit in and pump the brake pedal. If you have a servo, run the engine while you do it. Lie under the car with a tube on the bleed nipple with the end in a container with some brake fluid in. Keep the pipe end under the surface. Then when the helper pushes the brake pedal to the floor, open the bleed nipple. Get them to pump the pedal slowly to the floor and release. You should see air bubbles coming out of the pipe. After three or four pumps, get them to hold the pedal down and then tighten the nipple. Get them to pump the pedal three or four times and then hold it down while you open the nipple again. Three or four more pumps and then repeat. Hold the pedal down and close the nipple. Check the fluid in the reservoir, top up if needed. Just keep going until the bubbles stop and fluid comes out. You may need to bleed the other three wheels too. Check your manual to see which order of wheels to check. If you can borrow a device which attaches to your reservoir and uses pressure to force the fluid through to the nipples it is much easier and quicker