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 right ventricle pumps the blood to the lungs through another valve, called the pulmonary semilunar valve, and then it returns to the left atrium. The blood flows through the bicuspid valve into the left ventricle. Again, when all the blood is in the left ventricle, the bicuspid valve slams shut to prevent blood from flowing backwards.