To repair an American Standard faucet, turn off the water flow using the shutoff valve below the sink, and remove the spout to address water leaking from the base. Single-lever faucet leaks are typically the result of damaged or worn seals between the cartridge and valve seat. After pulling the cartridge, inspect the seals, and replace any that show signs of wear.
Older faucets commonly suffer from decreased flow rates and lower water pressure from the spout, which is typically caused by mineral deposits that build up within the cartridge. Removing the cartridge and allowing it to soak in vinegar overnight dissolves the deposits. Soaking components in vinegar also resolves another common issue, clogs within the spout aerator.
Leaks coming from any part of the faucet are commonly the result of loose hardware connections. Make any adjustments needed to the faucet base, spout or components using adjustable pliers. Resolve leaks that occur at the base of the spray attachment by removing the spout and tightening the attachment hose connection located at its base. Simple repairs may also fix issues with water temperatures. Adjusting the temperature limiter located under the base of the faucet is a relatively simple operation and may be performed with only a hex wrench.