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The self servo effect is used most commonly applications like drum brakes on vehicles. Most textbooks call this effect "self-energizing" and not "self servo". The rotation of the drum can drag either one or both of the shoes into the friction surface, causing the brakes to bite harder, which increases the force holding them together. This increases the stopping power without any additional effort being expended by the driver, but it does make it harder for the driver to modulate the brake's sensitivity. It also makes the brake more sensitive to brake fade, as a decrease in brake friction also reduces the amount of brake assist. Also, small changes in the coefficient of friction will cause large changes in the pedal force required for braking. This coefficient of friction change can be the result of temperature or more commonly, a wet surface (ie rain, puddles, etc.). The change from drum brakes to disc brakes occurred because of these reasons - disc brakes have better dissipation of heat, less wear, less susceptible to changes in coefficient of friction, and without self-energizing drivers can better gauge pressure placed on the brake pedal to prevent lockup. Not to mention drum brakes also are prone to "bell mouthing", and trap worn lining material within the assembly which can cause braking problems.

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Related Questions

What is the meaning of self - servo action?

chisy chisy


Self servo action?

Self-servo action: Is where a leading shoe is effectively self applied to the drum. During rotation of the tyre, the leading shoe tries to rotate in the direction of the drum and then forms a wedge and eventually effectively applying itself to the drum. I guess that's the best answer you can get


What is the effect of feedback on DC servo motor performance?

the sprrd regulation is cnsiderably improved.


Can drum brakes be servo or non servo?

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What is a Micro Servo?

A micro servo is a small servo. The term can be used to describe any servo that is smaller than a "typical" servo. For example a servo that is about 1.5" x 1.5" x 0.5" would probably be called a micro servo. Most servos use the same signals and voltages, so usually a micro servo can be plugged into any servo controller or radio receiver that a regular servo can be plugged into.


What is brake servo?

A brake servo is a servo that is used for brakes That's all folks


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What is self-servo action?

It is the action of the Brake shoe which increases due ti the direction of the rotation It is the action of the Brake shoe which increases due ti the direction of the rotation Self servo action: As the drum rotates the leading shoe wedges against the drum causing the trailing shoe to make contact. (info by PC_luke)


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