asoomal wrote:Try the master first, booster may still be fine.
From my experience, it's best to just go ahead with a new booster also. The car is already 20+ years old, the diaphragm is jelly by now.
Replace both the booster and master cylinder. Take the calipers off and try to compress the pistons with no lines hooked up and the bleeders out (it should be easy with the lines and bleeders off). If they don't move, they're seized. You can try to rebuild and hone them, or replace. If the pistons move freely, then there's a good chance the blockage is in the lines. If so, try pressing the brake with the calipers off to see if you get fluid to come out. If no fluid comes out, my bet is the braided lines depending on the manufacturer.