Chevy, brakes

Hi. I have an 89 Chevy Caprice. The brake line on the rear left had a leak in it. I changed the brake line from the center of the rear to the left rear wheel. I couldn't change the rusted nut so put on a new cylinder, so I wouldn't have the same problem with the nipple as I did with the nut. All is put back together and the brakes bleed but no pressure on the pedal. I changed the brake cylinder, under the hood where the fluid resevoir is and still no pressure. I bled the brakes from the coiled line below the resevoir. No pressure still. Do I have to bleed all the brakes on each tire, or could it be the brake booster?
thanks in advance. Could it be the brake line I put in???:banghead:

Hi. I have an 89 Chevy Caprice. The brake line on the rear left had a leak in it. I changed the brake line from the center of the rear to the left rear wheel. I couldn't change the rusted nut so put on a new cylinder, so I wouldn't have the same problem with the nipple as I did with the nut. All is put back together and the brakes bleed but no pressure on the pedal. I changed the brake cylinder, under the hood where the fluid resevoir is and still no pressure. I bled the brakes from the coiled line below the resevoir. No pressure still. Do I have to bleed all the brakes on each tire, or could it be the brake booster?
thanks in advance. Could it be the brake line I put in???:banghead:

Bleed the entire system; the booster will only make the pedal stiff, not kill the pressure. If you have no pressure at the brakes, then there is air in the system. Bleed the entire system from the master cylinder down.

make sure you turn on the car while pumping the pedal, i found that it makes it a whole lot easier.

Disregard that last post - you NEED to do it with the car OFF so that you can get a feel of the pedal for when the air bleeds out - you will not get this with the engine on, also you can spray flammable, paint-killing brake fluid at high velocity with this manner. Leave the engine off and pull the vacuum check valve off the booster (don't forget to put it back on when done).

Sorry kahjdh - safety is the issue here.