I've noticed a problem with the brake lever corresponding to the rear brake for a cheapo kids bike i'm working on. After squeezing the brake lever it won't full return to its resting place. This was actually causing the brake to rub slightly until you pushed the lever back with some force.
After unhooking the brake cable I can confirm the issue is with the brake lever itself. I hit the inside of it with some WD40 and messed around with a screw that the lever pivots off of (without really knowing what I was doing). This helped a little but its still grabbing the back wheel.
Has anyone experienced this before/know what to do?