why wont the front brake release when i let off brakes
on 1990 Chevrolet 1500 Pickup

i have tryed bleding off lines and they still wont release

Asked by for the 1990 Chevrolet 1500 Pickup
Simple, if you opened bleeder screw ,and it is not pluged with dirt, and brakes still wont release CALIPER piston is stuck!!!
Agree, if bleeding brakes allowed fluid to pass least one caliper piston is frozen. Just figure out which one and replace.
2 more answers
Your brake lines have failed internally, replace BOTH brake lines and recheck.
Yikes! maybe your brake lines are bad