Hitch for a cart for braking I was designing a cart for personal use. I live in an area with elevations on the road, and I fear braking might be an issue for the cart I have behind my bike.
Can anyone suggest a good mechanism they might have experienced or seen for brakes on a cart attached on the back of a bicycle. 

Also, How is there a Hitch which is flexible enough for absorbing the force during braking.
This site describes a prototype flexible hitch for pulling carts that includes an automatic braking system. It describes using a spring loaded rod inside an outer tube, with a segment of brake cable attached to the tube:


  The simple brake cable design will make use of the force of the
  trailer moving towards the bike, which also moves the housing with the
  brake cable towards the bike. This force pushes the cable into the
  rod, which causes tension on the cable and engages the brakes.




(I believe it's ok under the CC license to republish their diagram by attributing it to the authors of the original article, Matt Ramirez, Chris Carvalho, and David Hernandez)