How do you replace a washer in a brass basin faucet?

To replace a washer in a brass basin faucet, you can follow these general steps:
Gather the necessary tools: You'll typically need an adjustable wrench, a screwdriver (Phillips or flathead, depending on the faucet), a replacement washer that matches the size and type of the existing one, and a cloth or towel to protect the surface.
Turn off the water supply: Locate the water shut-off valves under the sink and turn them clockwise to shut off the water supply to the faucet. If there are no individual shut-off valves, you may need to turn off the main water supply to the house.
Release any remaining water pressure: Open the faucet to relieve any remaining pressure in the water lines. This step helps prevent excessive water leakage when disassembling the faucet.
Remove the handle: Use a screwdriver or an appropriate tool to remove the screw holding the handle in place. Set the screw aside, and carefully remove the handle from the faucet by pulling or twisting it off. Some handles may have a decorative cap covering the screw, which you can gently pry off with a flathead screwdriver.
Access the washer: Once the handle is removed, you should have access to the stem assembly. In some faucets, you may need to unscrew a retaining nut or collar to expose the stem and washer.
Replace the washer: Locate the washer at the end of the stem assembly. It may be held in place by a screw, nut, or be compressed between two parts. Remove the old washer and replace it with the new one. Ensure the new washer is the same size and type as the old one to ensure a proper fit.
Reassemble the faucet: Reverse the steps taken to disassemble the faucet. Place the stem assembly back into the faucet body, reattach any retaining nuts or collars, and secure them tightly. Place the handle back onto the stem, aligning it properly, and secure it with the screw.
Turn on the water supply: Once everything is reassembled, gradually turn on the water supply by opening the shut-off valves. Check for any leaks around the faucet and handle connections.
Test the faucet: Turn on the faucet and let water flow to check if the new washer has resolved the issue. Ensure there are no drips or leaks. If necessary, make minor adjustments to the handle or stem assembly to achieve a proper seal.
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