Recon front brakes…adjustable?

running my old bald tires, front brake worked ok. Replaced rear tires, now won’t stop the bike (still have mostly worn tires on front). Jacked bike up in the air. Spun front wheels, hit brake and stopped. Held front brake lever and could turn wheel By hand…very little resistance. Going to dive into my repair manual,

Know I have front power drum brakes. Are these adjustable like the rears?