PPT on Hydraulic brakes by Love soni

1. HYDRAULIC BRAKES
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CONTENTS
INTRODUCTION
TYPES
PRINCIPLE
CONSTRUCTION
a) MASTER CYLINDER..
b) WHEEL CYLINDER.
c) BRAKE SHOES.
d) BRAKE DRUM.
e) BRAKE FLUID.
 SYSTEM OPERATION
 ADV. AND DISADV. OF HYD. BRAKES
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BRAKES
A brake is a mechanical device
which inhibits motion.
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INTRODUCTION
HYDRAULIC BRAKES:
Hydraulics is the use of a liquid under pressure to transfer
force or motion, or to increase an applied force.
The pressure on a liquid is called hydraulic pressure.
HISTORY:
In 1918 Malcolm Lockheed developed a hydraulic brake
system.
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TYPES OF
BRAKES
Mechanical Brakes
Hydraulic Brakes
Power Brakes
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PRINCIPLES OF
HYDRAULIC
BRAKING
Hydraulic brakes work on the principle
of Pascal’s law which states that
“pressure at a point in a fluid is equal in
all directions in space”.
According to this law when pressure is
applied on a fluid it travels equally in all
directions so that uniform braking action
is applied on all four wheels.
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CONSTRUCTION
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a) MASTER
CYLINDER
 The master cylinder is the heart of the brake's hydraulic
system.
 It converts the force exerted on the brake pedal into hydraulic
pressure to apply the brakes.
 Depressing the brake pedal moves a push rod in the
master cylinder. Mounted on the push rod are a pair of pistons
(primary and secondary) in tandem (one after the other) that
exert force against the fluid in the master cylinder bore.
 The pressure created displaces fluid through the various brake
circuits and lines to each of the wheels and applies the brakes.
 Since brake fluid is incompressible it acts like a liquid linkage
between the master cylinder's pistons and the calipers and
wheel cylinders.
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Master Cylinder
Diagram
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b) WHEEL
CYLINDER
A wheel cylinder is a component in a drum
brake system. It is located in each wheel and is
usually at the top, above the shoes.
Its responsibility is to exert force onto the
shoes so they can contact the drum and stop
the vehicle with friction.
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c) BRAKE SHOES
Brake shoes are made of two pieces of sheet
steel welded together.
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d) BRAKE DRUM
The brake drum is generally made of a special
type of cast iron. It is positioned very close to the
brake shoe without actually touching it, and
rotates with the wheel and axle.
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e) BRAKE FLUID
Brake fluids are used to transfer force into
pressure. It works
because liquids are incompressible.
Since oils damage rubber seals and hoses in the
braking system, brake fluids are not petroleum-
based.
Most brake fluids used today are glycol-
ether based, but mineral oil and silicone (DOT
5) based fluids are also available.
It is a special type of fluid named SAE-1703J
and must meet the following requirements:
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14. LOGOLove soni

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ADVANTAGES AND
DISADVANTAGES OF
HYDRAULIC BRAKES
Advantages
a) Equal braking action on all wheels.
b) Increased braking force.
c) Simple in construction.
d) Low wear rate of brake linings.
e) Flexibility of brake linings.
f) Increased mechanical advantage.
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Disadvantages
a) Whole braking system fails due to
leakage of fluid from brake linings.
b) Presence of air inside the tubings ruins
the whole system.
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THANK YOU
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