My wife picked a child on our church's "giving tree" who asked for a bike. The child is about 6 or 7. We've picked up a bike a Target (yeah, I know) and I've gone over it to make sure everything was okay, tires inflated, etc. Everything seems fine except for the rear rim brake. Why this bike even has a rim brake is beyond me, considering it has a coaster brake, too.
When the brake is applied, both halves move to the rim. But only the half marked "A" retracts when the brake is released. The "B" half stays in contact with the wheel. I need to deliver this bike to the church this weekend. I've tried loosening and realigning the whole piece, but this hasn't helped. The front brake works perfectly fine, with both sides retracting.
Is this fixable? What am I missing? Any quick help would be appreciated. Thank you!!
Here's a photo of it:
