When I plug the pedal in and play, the music is constantly sustained without me pressing the pedal. Do i need a new pedal ? Is the problem within my Roland ? Please help ! - I use a Roland 700 GX. -The piano was previously left idle for 4-5 months. Thank you so much.

1.Make sure you are plugged in to DAMPER (not FC1 or FC2) 2. Check to see if the notes STOP sustaining when you PRESS the pedal. If that is the case, first try turning off the Roland with the pedal plugged in and restarting with the pedal pressed down. 3. Press the EDIT button and scroll to Damper Polarity. See if it's set to Standard or Reverse. 4. If problem persists after all that, try holding the pedal jack into the Roland at different angles and then try the same with where the cable connects to the pedal. At that point, you can either attempt to repair the pedal or get another one.
Hope this helps, Stewart

The same thing happend to one I inherited from family. By process of elimination
I discovered the issue was inside the pedal with two thin metal contacts not properly bent. When the pedal is depressed the two should separate causing the note to be sustained. When the pedal is let up again the two contacts should touch, causing the note to be discontinued. My contacts had, over time, gotten bent so they never made contact. I toyed with them a few times until I achieved the desired effect, then reassembled the pedal and all is well. I had previously had the same symptom...plug in and notes were sustained without even depressing the pedal. Now it works great!