Bleed brakes on a 1995 Chevy Suburban

The normal cause of a spongy pedal is air in the line. When bleeding the brakes do the following-- get a piece of vacuum hose long enough to go from the bleeder valve to the ground. Get a mason jar and fill about 1/3 the way with brake fluid, The vacuum hose should fit tightly over the bleeder valve and go from the valve to the mason jar. Fill the brake reservoir with brake fluid. If possible, have someone depress the pedal for you. Have them pump the pedal -- As they start to depress the pedal, open the bleeder valve and allow air to escape. -- You'll see it bubble in the mason jar at first. However, once you've gotten the air out of the vacuum hose you'll see the amount of fluid in the jar rise. THIS is what you want! It eliminates air getting back into the line as you work. Continue bleeding the lines until you see no more air bubbles. So long as you keep the vacuum hose IN the mason jar brake fluid, air will not be able to return into the brake line. Have your helper let you know when he or she is getting close to the bottom of the depression-- that way you can close the bleeder valve a tad early-- it will make things go faster for you. You c-a-n do this without help it just takes a little longer--- and ONLY works with the mason jar brake fluid-- which eliminates air getting back into the line.