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 atrioventricular valve (or right AV valve), also called the tricuspid valve, (for its three leaflet lobes) controls the flow of blood between the right atrium and right ventricle. (The opening itself is the right atrioventricular canal.) It prevents dexoygenated blood from regurgitating back into the right atrium. The vale is called tricuspid because of its three leaflets; it must be noted however, that the tricuspid valve can contain between two and four leaflets.