Join Date: Jun 2005
Location: Angus, Scotland
Its a U brake. The thing on the top of the forks is a Gyro cable detangler. They go by various names. You need an upper cable and lower cable that are for the Gyro, and suitable for your U brake, and the height of the bars. That can be expensive and complicated to get set up properly.
You can just run a simple brake cable from the handlebar lever, down along the top tube to the cable stop. then the inner wire has a cable hanger thing on it. A triangular bit of metal, with a cable clamp bolt and a groove for the straddle cable. A straddle cable fits into the top of the brake arms. It might need a cable that's specific to the make of the brake. Or it might be able to fit a bit of brake inner wire.