EZGo Marathon brake issue?

[GADawg9977]

Hello, Newbie here. I've checked stickies but haven't found exactly what I'm experiencing. Recently purchased 1988 EZGO marathon that was not running. Purchased new batteries, solenoid, and speed control (the porcelain plate on top was crumbling. Cost almost as much for new speed control as just the plate). Anyway, got everything hooked up and have power. I had cart up on jackstands and when pressing the excelarator the rear passenger side tire spins. The driver side rear does not spin or "free wheel". Is this normal? Took it off stands and test drove. Seem to drive fine but seemed a bit sluggish. Wasn't sure if this was symptomatic of a brake dragging or stuck. Should the driver side tire spin? Thanks in advance for any advice.