I took my RadRunner into to replace the rear brake pads at a local bike shop.  After getting it back from the shop I noticed that the pedal assist is not as powerful as before.  If I go from speed one to 2 it feels like it used to feel on 1.  It seems like it is struggling.  Does anyone else have this experience or know why it's like this?  Everything seems to be working fine but the pedal assist feels strained and not as powerful. 

Any insight is appreciated thanks!