Not normal.
..
You can fix the leak using the right parts found at
http://www.ereplacementparts.com/
..
use some soapy water to find out where the air is escaping.

"SBH" wrote in message
news:d9KdndXiDug4QNTanZ2dnUVZ_hSdnZ2d@wideopenwest .com...
I bought a used pancake compressor and just used it today. When I turned it
on, it reached it's peak level and turned off, which I know is normal. Upon
viewing the pressure gauge I saw it was dropping fairly quick. My hearing
isn't good, therefore, I asked the wife if she heard a leak and she did. I
pin pointed the air coming from a hole from the regulator valve which lies
under the cap. Therefore, my question, is this normal? I can't imagine it
being normal since it continuously turns my compressor on when it falls
below the set pressure. I tried turning the valve all the way in and air
still leaks. If this isn't normal, is it safe to assume I can replace it?

Thanks for all help.