Brake issues, 1990 Trail Boss 2×4

I am having an odd issue with my wife’s Trail Boss. I am having poor brake performance. The handle is rock hard first pull, every pull, but I don’t seem to get good stopping power. Tonight I noticed I could pull it hard and lock up the left front, don’t think I ever got the right to lock. I can stand on the foot brake and lock the rear up easily. I haven’t ever the brakes on this bike because it had always had a tight pull. I am wondering about a possible restriction causing the issue. Does that seem plausible? Any help is appreciated!

Rob