A leaky shower can often be fixed with a simple repair. The first thing to do when fixing a leaky shower is to figure out the brand of your shower valve. Although most shower valves are fairly similar each brand is just different enough to make repairing them a brand specific project.
Here are some common shower brands and how to repair them when they are leaking.
A Moen shower valve cartridge contains the various working parts that can go bad with time so replacing it can solve various problems. The pressure balanced shower valves balance incoming hot and cold water and keep the temperature within a few degrees of the original temperature despite demands of a flushing toilet,running dishwasher, or other uses of the water supply while your taking your shower.