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.
Here are the four valves in order of circulation: TRICUSPID VALVE. Closes off the upper right chamber (or atrium) that holds blood coming in from the body. Opens to allow blood to flow from the top right chamber to the lower right chamber (or from right atrium to right ventricle). Prevents the back flow of blood from the ventricle to the atrium when blood is pumped out of the ventricle.