Have soft brake pedal on93 silverado has master cylinder and block what is the proper method for bleeding air from system?
The preferred method is to use a pressure bleeder and bleed all
4 wheels at the same time. If a pressure bleeder is not available,
use an assistant to pump the brake pedal several times and then
hold pedal pressure. Starting with the farther most caliper from
the master cylinder . Bleed each caliper until all air is expelled.
make sure that assistant does not take his foot off pedal until
bleeder valve is closed. Do each caliper from farthest away from
master cylinder to closest. If master cylinder was not bench bled
when installed, remove it and do that first. Then continue with the
rest of the procedure.