The Plymouth does not have air brakes, it has a hand brake operated by a hand wheel at the engineers right side. The brakes were never that great since we have been operating it. I noticed that when the hand brake was tight the shoes on the left side of the engine were not contacting the wheels. I checked with Steve and decided to adjust the left side brake. My first thought was to make the shoes reach farther, lengthen the adjuster link. The threads on the link were rusty and painted. I cleaned up the threads, reinserted the link and adjusted it. I soon saw the adjuster needed to be shortened. It works better now