No clutch pedal pressure after car sits
 

My S2000 often sits for a few months without being driven. Lately, I found that the clutch pedal has no pressure. I have to pump the pedal a few times and eventually it builds up enough pressure to drive around. It's fine for a drive around town and then after I park it again for a few months, no clutch pedal pressure. Any idea what I should look into? Thanks!

is there a fluid leak?

Also, could the fluid may need bleeding.

Thanks for the response. If there is no fluid leak around the master cylinder, is it safe to assume that there could be a leak around the slave cylinder? The fluid level doesn't seem low.

I had the Billman once over service done a few months ago so i assume the fluid was checked and replaced as well.