working , principle

1. “HYDRAULIC BRAKING SYSTEM”
Presented BY ,
MOHIT SHARMA
(151200224
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2. What is Braking ?
 Braking is the Action of Stopping the running vehicle.
 Action of braking is done by using Brake.
 In Brake The kinetic energy due to motion of the vehicle is
dissipated in the form of heat energy due to friction between
moving parts (Between wheel Drum and Brake Shoe).
Function of Brake –
There are two main functions of brakes :
 To slow down or stop the vehicle in the shortest possible time
at the time of need.

3.  To control the speed of vehicle at turns and also at the time of
driving down on a hill slope.
 Classification of Brakes –
 On The Basis Of Method Of Actuation-
 Foot Brake
 Hand Brake
On The Basis Of Mode Of Operation-
 Mechanical Brakes
 Hydraulic Brakes
 Air Brakes Vacuum Brakes
 Electric Brakes.

4. On The Basis Of Method Of Application Of Braking Contact-
 Internally – Expanding Brakes
 Externally – Contracting Brakes
 What is Hydraulic Braking System?
Hydraulic Braking System is the System Which used Hydraulic Fluid to
build up the pressure for Braking Action.
 History-
 Fred Duesenberg originated hydraulic brakes in 1914.
 Then In 1918 Malcolm Lougheed Developed full Hydraulic
Braking System.

5. PRINCIPLE OF WORKING-
Hydraulic brakes work on the principle of Pascal’s law.
Pascal law states that “pressure at on Incompressible fluid is
equal in all directions”.

6. TYPES OF HYDRAULIC BRAKE-
There are Two types of Hydraulic Breaking System.
1. Expanding Drum Type hydraulic Brake.
2. Disc Type hydraulic Brake.

7. COMPONENTS OF DRUM TYPE BRAKE
SYSTEMMaster
Cylinder.
 Backing Plate.
 Brake Drum.
 Wheel Cylinder.
 Brake Shoe .
 Return spring.

8. Master Cylinder-

Master Cylinder is Heart of Hydraulic Braking System. It
pressurized the Braking Fluid Which is in Reservoir to actuate
the Wheel Cylinder for braking Action.

9. Tandam Master Cylinder-
 Tandam Master Cylinder is
Latest Development in
hydraulic Braking System.
 It reduced Risk of Brake
Failing.
 There are two Different
section in tandam Master
Cylinder for pressurized the
Brake Fluid.

10. Backing Plate-
 Backing Plate is Base for
other Component.
 Wheel Cylinder, brake
shoe, Parking brake
mechanism are mounted
on it.
 It should be strong and wear resistant.

11.  Drum is rotated with wheel
and Axle.
 Brake Shoe are pressed
against the Brake Drum as
Beake Applied.
 It is heat conductive.
Wheel cylinder-

12.  There is seperate wheel
Cylinder for each wheel .
 It function is to exert force
on Brake shoe.
 It consist of two piston one
on each side.

13. Brake Shoe-
 There are two Brake Shoe for
each wheel.
 Friction Material is at outer
lining of Brake Shoe.
 It should be heat and wear
resistant.

14. Return Spring-
Return Spring pull the
brake Shoe back as Brake
Pedal is released.

15. Working of Drum type Hydraulic Brake-
Brake Pedal Pressed.
Brake Fluid Pressurized in Master
cylinder.
Pressurized fluid is travel through hose
pipes.
Pistons in wheel cylinder are actuateand
pressed brake shoe against wheel Drum.
Due to Friction between Brake Shoe and
wheel Drum Braking action is performed.

16. Component of Disc type Hydraulic brake system-

17.  Brake Rotor.
 Brake Caliper.
 Brake pad.
Brake Rotor-
 It is component against which Brake pad is Appiled.
 Brake Rotor is made of Grey iron or special alloy.
 It rotate with wheel.
 Hole are drill on Brake Rotor for heat dissipation.

18. Brake Pad-
 Brake Pad is Frictional Component of Disc brake.
 Generally there are two Brake Pad per Caliper in Disc Brake.
 It is palced in front of caliper piston.
Brake caliper-
 It is assembly which house the Brake pad and Piston.
 It is made from plastic , aluminium or chrome plated steel.
 Two Types- Fixed and Floating caliper.

19. Working of Disc Type Hydraulic Brake-
Brake Pedal Pressed.
Brake Fluid Pressurized in Master
cylinder.
Pressurized fluid is travel through hose
pipes.
Thus, this Pressurized fluid press Brake
pad against Brake Rotor.
Due to Friction between Brake pad and
Brake rotor action is performed.

20. Valves Used in Hydraulic Brake System-
1.Proportioning valve or equalizer valve-
2. Pressure differential valve-
3. Combination valve
Brake Fluid-
 Brake Fluid is Typical Type of Fluid which used
in Hydraulic Brake system.
 Brake Fluid is incompressible.

21.  Glycol- ether, Castor oil , Mineral Oil are
example of Brake Fluid.
Characteristic of Brake Fluid-
 Boiling Point
 Viscosity
 Corrosion Resistance
 Compressibility
Advantage and Disadvantage Of Hydraulic
Brake-

22. ADVANTAGES-
 Equal braking action on all wheels.
 Increased braking force.
 Low wear rate of brake linings.
 Increased mechanical advantage.
 Better stopping power than the other Brakes
DISADVANTAGES-
 Whole braking system fails due to leakage of fluid from brake
linings
 Complex construction.
 More maintenance than other system
Application -

23.  Automotive Brake-
The Hydraulic Braking System is use in car , Jeep ,
Mini Truck o in Buses