What is the self-servo action on drum brakes?

Answer 1

When the brake cylinder pushes the two shoes apart, the leading shoe "wraps" with the rotating drum. This wrapping pushes the trailing shoe through the transfer bar into tighter contact with the drum providing the servo action.

Notice that your leading shoe nearly always has more brake lining than the trailing shoe and also notice that it requires more pedal effort to stop a car with drum brakes when it is going in reverse than it does when the car is moving the same speed in the forward direction.

Answer 2

Oh, dude, the self-servo action on drum brakes is when the leading shoe is pulled into the drum by the rotation of the drum itself. It's like the drum is saying, "Come here, shoe, let me stop you!" So, basically, it helps with the braking force and makes sure you stop when you need to. Cool, right?

Answer 3

Ah, the self-servo action on drum brakes is a beautiful thing. It's like nature working in harmony. When the brakes are applied, the rotation of the drum helps to push the shoes into the drum with more force, making braking more efficient. Just like adding a happy little tree to a painting, the self-servo action adds a touch of magic to how drum brakes work.

Answer 4

Self-servo action in drum brakes refers to the design feature that amplifies braking force when the brakes are applied. This is achieved through the rotation of the brake shoes, which causes them to press harder against the drum as it rotates. The self-servo action helps to improve braking efficiency and reduce the effort required to apply the brakes, making it a key component in drum brake systems.