Flush the system and look for contaminants. If there is a bleed on the proportioning valve, also flush there. If there are contaminants, your master may need to be replaced. If not, maybe the proportioning valve has failed again.
SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch
change dump valve under master cylinder
SOURCE: I had the front disk brake pads and rotors
check you fluid brake fluid level, and rebleed the system. that should help it out, sounds like you may have air in the line.hope this helps
SOURCE: Rear brakes not working proper.
e-brake pedal should go farther- is either out of adjustment or cable frozen- secondly sounds like only front brakes receiving enough pressure to "activate" properly- bleed all four brakes starting rear pass,then rear drive ,then front pass, then front drive- use plenty of fluid- bleed till fluid is clean without bubbles- will that long at first- this will insure not bubbles and no moisture- if a pro valve dies,you would have more problems- pedal would be really soft,would have both a brake light and abs warning lights
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