UncleScoot,
To answer koolkar's question..I don't know much! This is what I think I know...unless this rig has a spring brake, then the service brake has long since pulled the linings away from the drum. If it has a spring brake then you pop the little plastic access cover on the back and compress the spring using a socket? This pulls the linings back too. Doing this allows you to move a truck that has no air in the system.
Stuart.
