How Do Disc Breaks Work?

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Okay folks, here's my new entry with a new question.
Today I was watching a Pulsar 220, really cool bike, but wait what do you see in its brakes? Yeah I know that those are disc brakes but wait, why are there holes in it? If there are holes in it then why don't we call it fix brake? These all questions paved the way for me to search for it and here I am and really lot of people think that disc brakes actually work on the principle that some sort of drill fits in it and the bike stops! NOOOOO! Actually, disc brakes work on the principle of friction.
It mainly has three components: 1.
THE DISC: It's actually the rotating wheel on which a tyre is fitted and where the action of brakes apply.
As a lot of heat is generated while braking, the disc has to be made of only solid cast iron or ceramics in superfast cars.
And now the holes, actually the holes that u see in the pulsar or the RTR are actually meant to minimise the action of heat and increase action of braking.
Thus they are called so VENTILATED DICS and NOT FOR BRAKING PURPOSE! 2.
THE CALIPER: The caliper is nothing but the box like thing you see on the brake.
It has pistons, that do the action of braking.
So when you brake, u actually convert the kinetic energy of your car to heat energy.
They do this hydraulically (or in some cases-electromagnetically).
THE BRAKE PADS: The brake pads are actually designed for high friction.
Another misconception among people is that brake pads come in contact with the disc but NOOO! But they actually generate semi liquid friction boundary which actually provides and comes in contact with the disc while braking.
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