Follow These Basics For All Faucet Repairs
Before you start, examine the faucet closely to determine where the water is coming from. Leaks around the base of the spout require a different repair than a drip from the end of the spout.
Then turn off the water supply to the faucet. You'll probably find shutoff valves under the sink. If those valves don’t work or if you don’t have any, you'll have to close the main water valve to your entire home. After you turn off the water, open the faucet in the center position to relieve water pressure and make sure the water is shut off. Finally, cover the sink drain holes with strainer baskets or rags to avoid losing small parts down the drain.
Pay close attention to the order and orientation of parts as you remove them. A digital camera or video camera is handy for recording each step in case you forget. For easier reassembly, set the parts aside in the order they were removed. When all the parts are out, inspect the interior of the valve for bits of deteriorated gaskets or mineral deposits. Use a cloth or fine nylon abrasive pad to clean the surface. Loosen mineral deposits by soaking them in vinegar.
Slow water flow can be caused by plugged holes in the faucet body. Use a small screwdriver or penknife to clean them out. Before you replace worn parts and reassemble the faucet, hold a rag over the faucet and open the water shutoff valve slightly to flush out debris that may have been loosened during the cleaning and inspection.
After the faucet is reassembled, open the faucet to the middle position and gradually open the shutoff valves to turn on the water. Leave the faucet open until water flows freely and all the air is out of the pipes. If the water flow through the faucet is slow, the aerator (Figure A) may be plugged. Unscrew the aerator and clean it out.