Question: When ever I use the faucet in the bathroom sink, the faucet in the shower leaks although it is shut off. I built that bathroom a few years ago and this problem started only recently. The faucets I have are, Kohler faucets.
Answer: I’m not sure how that is even possible since each faucet has it’s own shutoff. Does it leak only when you shut the water in the sink is being turned off? Or, does it dribble continuously while the sink faucet is on?
Whichever the case, it may be time to replace the cartridge in the shower valve. Scale from hard water can really muck these up in a hurry. Most good home center stores carry a large selection of replacement stems and cartridges.