Hey I'm new here. I have an 03 6 that is right at 90k miles. Today while driving, when I pushed the clutch pedal in to shift it made a popping noise. Since then it does it every time I push the pedal in and release it. I got down and looked and it seems to be coming from that little rubber piston thing that goes into/out of the firewall when you push the clutch in or release it. Any ideas what it could be? A simple lubrication fix maybe?