The Crust Clydesdale fork has mounts for two brakes - a disc and a V / cantilever. I am using a V-brake as a parking brake. The third brake lever is a Dia-Compe with locking mechanism - similar to what many recumbent trikes have. Apply the brake, push the button in, release the brake, release the button and the lever maintains cable tension, locking the wheel. Just apply the brake lever again and release and the button pops out and the parking brake is off.
You can also get a brake lever that applies two brakes at once, but I thought the parking brake along with the SteerStopper to lock the forks straight ahead is what a cargo bike needs.
The twist ties are just temporary until I am satisfied with cable lengths and routing.
The blue cables are to match the blue Clementine decals.
Laing