1. Brakes

2. Friction & Braking
Friction: A force that opposes motion, it prevents the sliding between two surfaces that are in contact.
Amount of friction depends upon:
surface material
surface finish
force, acting upon the surfaces
By using friction, brakes slow down or stop a rotating object.

3. Braking Action
Brakes slow down a moving object by converting the kinetic energy of motion into another form.
Most braking systems convert this kinetic energy into heat.
The brake is cooled by moving air.
If a brake becomes too hot, it will begin to lose its efficiency. This is called fade.
Good brake design includes methods for adequate cooling of the brakes.

4. Brakes
There are many different types of braking systems. Some of the more common types are:
Disc
Mechanical
Hydraulic
Pneumatic

5. Disc Brakes
A friction pads is pressed against both sides of a rotating disc.
This type of brake is commonly found on the front wheels of cars.
They have good air flow around the brake which quickly dissipates heat.

6. Disc Brake

7. Mechanical Brakes
Braking action is applied by physical force without the aid of hydraulics or pneumatics.

8. Hydraulics & Pneumatics
Hydraulic and Pneumatic systems are closely related. Both use cylinders to produce a linear motion at varying speeds and forces.
Hydraulics uses a fluid, hydraulic oil.
Pneumatics uses air.
Advantage of hydraulics is that oil can’t be compressed.

9. Hydraulic - Pneumatic System

10. Hydraulic Brake