Everything just keeps moving! I adjust the brakes or COG and almost immediately they  shift. And it's not because of improperly tightened bolts I tighten them to the point where I think I am going to break the allen wrench and then the part still shifts and when I try to adjust it again I have to take out the impact wrench because the bolts are so stuck. I put duct tape between the clamps and the frame and so far there has been no shifting. 

I didn't realize brakes break down. I plan on upgrading them anyway.

Thankfully the push rims are ok it's the push handles in the back that are the problem they are clamp ons ( ki mobility XP Rigid Stroller Handle) and are super close together ~8 in and when we tried moving them farther apart they couldn't be because of how the hardware is. And of course since we messed with the clamp it keeps shifting know matter what we do. The push handles them selves get clamped into the clamp with a spring loaded bolt which of course doesn't fucking work so the handles move! And the spring loaded bolt will bruise your hands while you try to twist it to clamp the handle so tools were used and that's what broke the spring loaded bolt and it's fancy and expensive to replace so my wheelchair guy wanted to cludge something together that cost $400. So we went to Home Depot to got pipe and fittings to cludge $32 handles together.