On Dec 3, 8:50�pm, wrote:
On Dec 3, 6:21 pm, UMemo wrote:

This evening for a couple of hours my house had a major drop in water
pressure while the water department fixed a pipe down the block.

Strangely, a bathroom faucet on the first floor started leaking hot water
-- a slow stream, more than a drip but not a ton of water. �The kitchen
faucet did not leak, nor did any other fixtures in the basement or on the
second and third floor.

I assumed this was just a coincidence and the cheap no-name fixture the
previous owners had installed had just died at the same time, but nope. �As
soon as the guys finished work on the pipe and water pressure came back up,
the leak stopped too.

Any idea why less water pressure caused a faucet to leak?

You don't say what type of faucet, so I'm going to assume it was NOT
one of the older faucet-washer type.

If it is one of the delta or other one-handle type, I might guess that
it takes a certain amount of pressure to press the valve ball up
against the seals. �I sure don't like that idea though.
Anyone else.

a friends home has fire hydrant in front yard. each year at flushing
time their T&P valve on the hot water tank opens. you probably didnt
notice occasional high pressures during repairs