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 heart has four valves that separate each chamber so that, under normal conditions, blood cannot flow backwards. These valves can sometimes be replaced if they become damaged. The heartâs valves are: Tricuspid (right AV) valve: This valve opens to allow blood to flow from the right atrium to the right ventricle.