This brake system can do 2 things for your car (any car with an open differential*):
Lock your differential
Steering aid
ad.1 When a wheel is lifting off the ground, the traction is lost; It is however is possible to lock (brake) the wheel that is spinning, giving you back the traction.
ad. 2 When turning the steering wheel doesn't take you in the direction as quickly as you would like to go, reach for the "cutting brake". It is a great steering aid, that adds fun to your driving experience.
This "cutting brake" can control 2 wheels (usually the 2 rear wheels).
