new caliper sticking
 

im 19 and was just given a 92 sierra 1500. its 2wd but it was free. i changed the brakes and noticed a caliper was stuck. i changed the caliper and it acted ok for about 10 minutes. then the new caliper stuck. i thought maybe the brake hose collapsed so i changed it as well. 5-10 minutes later it stuck again. i need help, what could it be? all the other brakes work fine but the drivers side sticks all the time. its enought the truck stops when it sticks. what do i do? is it the mastercylinder? i dont have a pressure tester anymore so how do i test it?

That sounds like the problem is gonna be in the brake lines. Maybe some water causing corrosion and rust. Get a brake flush done at a shop.