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With the disk brake, the clamping force is parallel to the axis of rotation. With a drum brake, the clamping force is radial to the axis of rotation.

The figures included with the original post are fairly self explanatory.

Those asking for more explanation should try to understand the workings and then ask specific questions. To simply say "explain more" is a lazy response. The reader must put some effort into understanding.

DrD

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Seems that disc brakes are generally accepted as superior to drum brakes. How true is it? I can see the cooling and draining advantages of disc brakes over drum brakes, but do discs maintain their superiority in cool, dry conditions? The drum brakes seem to have larger brake shoes than the discs' brake pads.

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I think that for a lot of applications disc brakes offer much better serviceability. Disc brakes consist of few components and can be serviced much faster. A shoe pad replacement can be a complicated job for someone with little experience in mechanics. Replacing a disc brake pad, on the other hand, is extremely easy and quick. Disc brakes can also easily be adapted to different tasks, such as bicycles. 

In addition to serviceability, disc brakes are a robust method of breaking because they can be improved quite easily, by just adding more pistons, whereas a drum brake is really limited in improvement of design. 

I'm not sure what else you want to know, but this might be of some use.

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Disk break uses principle of applying force equally and oppossing with each pad, with same contact area against rotating disk loaded with centrifugal force..... While drum uses force radially applied, without oppossing force to a hub loaded with certrifugal force,  hence leaving the pad orphaned, creating less holding force than disk break.

Taking an analogy of stopping a rotating pulley using a single thumb by direct pushing as to stopping with thumb and a pointing finger by clipping. 

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Disc brakes:

1:The whole mechanism of disc brake is outside wheel.

2:It uses disc and calliper to provide friction.

3:Efficiency of disc brake is more than that of drum brakes.

4:Life and durability of disc brake is more as compared with drum brakes.

5:It dissipate heat more easily and quickly.

Drum brakes:

1:The whole mechanism of drum brake is in side the casing.

2:It uses drum and brake shoes to provide friction.

3:Efficiency is less.

4:Not efficient when it comes contact with water or during rainy season.

5:Less durability and heat dissipation.

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All in all a very comprehensive summary of the benefits and disadvantages of disc brakes in comparison to drum brakes. One aspect that hasn't been discussed though is the cost of manufacture of each braking system. To be fair, the question posed seeks only the differences in engineering however, cost of manufacture is ALWAYS a major contributing factor in determining which systems should be employed. In addition to being inherently more efficient, disc brakes are considerably less expensive to produce than drum brakes. Also, and important in vehicle handling characteristics, disc brakes carry less unsprung mass and so afford more responsive suspension.

Edited by Roger A Bailey

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On 18/12/2015 at 1:50 PM, akshansh Dwivedi said:

Disc brakes:

1:The whole mechanism of disc brake is outside wheel.

2:It uses disc and calliper to provide friction.

3:Efficiency of disc brake is more than that of drum brakes.

4:Life and durability of disc brake is more as compared with drum brakes.

5:It dissipate heat more easily and quickly.

Drum brakes:

1:The whole mechanism of drum brake is in side the casing.

2:It uses drum and brake shoes to provide friction.

3:Efficiency is less.

4:Not efficient when it comes contact with water or during rainy season.

5:Less durability and heat dissipation.

In my view nothing difference in efficiency. Based on the design configuration can be made to deliver same efficiency for same vehicle ? 

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Drum brake is basically a radial brake while disc brake is a axial brake because in drum brake ,the force applied in radial direction but in disc brake force applied parallel to the axis of break.

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Does above figure indicates that disc break feels eccentric axial compressive  force,ie  parallel to longitudnal axis and drum break feels compressive force,ie along longitudnal axis?

What is principle?

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Disc brake is used in quick breaking system and generally requires high maintainance and cost is higher in compared to drum brake 

Drum brake is a cheap braking system used in common vehicles it's uses radial parallel force , it's uses a pad which opposes a drum to stop against radial motion

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