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.
Best Answer: The tricuspid valve regulates the opening between the right atrium and the right ventricle. As the right atrium contracts, the tricuspid valve opens, allowing blood to eject into the right ventricle. When the atrium is finished contracting, the tricuspid valve closes, preventing a backwash of blood.Source(s): bioguy Â· 7 years ago.s the right atrium contracts, the tricuspid valve opens, allowing blood to eject into the right ventricle.