Hello everyone. I have a 1976 Chevy 3/4 ton full time four wheel drive with a 1985 GMC body. When i pull into a parking lot and push on the brake just a littleeeee bit it locks. Only that side. Anyone know what to do? has a V8 350 if that helps. Haven't taken a look at it yet, was wanting some advice before i dug into it. thanks everyone!

 

forgot to add, drum brakes. probably already knew that but just makin sure . would just adjusting that gear in there and opening up the distance help? thanks in advance.