The number and style of springs depends on the design of your drum brake system, of which there are effectively three (leading/trailing shoe type, twin leading shoe type and duo-servo type).

If you think your car has drum brakes, there’s no reason ... systems are a more advanced version of twin-leading shoe brakes. In this braking system, the two shoes are linked.

With drum brakes, a hydraulic cylinder/piston complement between two brake shoes then pushes each shoe outward and into contact with the inner surface of the rotating drum. The brake shoe lining ...