1 Swap in a new set of shoes, reconnect the brackets & springs, put the drum back on and youâre done.  Thereâs no need for compressors, or opening fluid lines to retract pistons with these setups. As a matter of fact, replacing brake shoes on some vehicles can be accomplished in under 2 minutes, once the drum is removed.
The bicuspid valve, sometimes better known as the mitral valve, allows blood to flow in only one direction (assuming it is functional) from the left atrium to the left ventricle, it prevents blood from flowing back from the left ventricle into the left atrium.
The tricuspid valve allows blood to flow from the right atrium to the right ventricle, and prevents backflow. The two semilunar valves allow blood to flow from the ventricles, either into the pulmonary arteries from the right side, or into the aorta from the left side, and prevent backflow.