My 2009-2012 Flip n Go brake lever broke. It is the red handle bar mounted lever with the brake mounted on the front right wheel.
I used the new style brake lever and mounted it on the frame. I had to cut back the brake cable housing with a zip disk in order to get the cable to the correct fit. It works great now.
ETA should have been 4-6 weeks, but it took only 7 days to get it to my front door.
Installation/change was about 10 minutes, and now the brake works perfectly again! And this is a now 12 year old cart, that will last some more seasons :)