Hey guys, ok i have an 86 chevy c10 i. Working on my brakes ive replaced everything lines, master cylinder, porportioning valve, cylinders. The problem im having is when i hit my brakes it will make a pop sound the my drivers side tire drum brake will just drag i can take it off adjust it a littlr will work for a few days then itll happen all over again, reverse is fine, just happens when i drive forward a few feet then pop then drags, any help would be appreciated