The cold water pressure got real low at my 2 handle lav faucet. I closed the hot supply and cold flows good through the hot valve but still not through cold valve. I don't see blockage when I take apart the cold valve.

What do you mean that you apart the cold valve?

Does your faucet has cartridges or stems?

What I would suggest to close the angle valves under the sink remove the cartridges or the stems now turn on the water for a few second to flush out the debris and see how is the flow if it gets better assemble your faucet if not time for replacing the cartridge or the stem, also can you tell me the brand and the model number of your faucet, good luck.

John

I think it's a price fister or knock off. I took the cartidge apart to where the "washerless" washer with the little spring is.
I wonder if I should run a piece of wire or something down inside that "washer"

Yes give it a try and also turn on the water before you install the cartridge, good luck.

Jon

Pulse the water supply on when the cartridge is out... if water flows strongly then the cartridge has become clogged and will need to be replaced. Home depot should have a replacement if you are lucky!

Good luck!

Mark