I had to change out a couple of valves (cold/hot) so that I can shutoff water to my upstairs master bathroom. The old ones leaked a little when I would try to close them. So I shutoff the main, shutoff the hot water heater, opening all the sinks to get the water out of the system and then changed out the valved. (The system is copper)

That went pretty well, one small leak on each valve, heated back up, cleaned out the solder, refluxed and then resoldered. After that, shut all the open sinks, shower, etc.. turned the water back on and was all set.

All of the other sinks, showers, toilets, etc had normal water pressure except one sink in my half bath. It is not downstream from the valves I replaced. When I turn on the water, both hot and cold, I have very little water that comes out.

Has anyone ever seen anything like this? Every other sink, shower, etc is perfectly fine.

Remove the cartridge from the bad sink. When you turn off water supplies and turn them back on, sometimes some "crud" gets loose. I'm betting there is something in there obstructing the flow.

Might be a good idea to have new o-rings, etc on hand so when you put it back together, all goes well.

Let us know if this helps.

Yeah, I opened the trap in the faucet earlier and it has a lot of crud built up. I cleaned it and all was well. I was thinking too big, should have thought simple first.

Thanks