Hydraulic brake system -ppt,sujankharel(ansal university)

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HYDRAULIC BRAKING SYSTEM

• Presented by
• ?Sujan kharel

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INTRODUCTION Hydraulic brakes

• The hydraulic brake is an arrangement of breaking
  mechanism which uses brake fluid to transfer
  pressure from the controlling unit which is
  usually near the operator of the vehicle to the
  actual brake mechanism which is usually at or
  near the wheel of the vehicle. HIS
  TORY In 1918 Malcolm lockheed develops a
  hydraulic brake system

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CLASSIFICATION OF BRAKES

• On the basis of method of actuation
• Foot brake(also called service brake) operated by
  foot pedal.
• Hand brake It is also called parking brake
  operated by hand.
• On the basis of Mode of operation
• Mechanical brakes
• Hydraulic brakes
• Air brakes
• Vacuum brakes
• Electrical brakes.

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• On the basis of Action on Front or Rear Wheels
• Front-wheel brakes
• Rear wheel brakes
• ? On the basis of method of application of
  Braking contact
• Internally expanding brakes
• Externally contracting brakes

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PRINCIPLES OF HYDRAULIC BRAKING

• ?Hydraulic brakes work on the principle of
  Pascals law which states that Pressure at a
  point in a fluid is equal in all direction in
  space
• ?According to the 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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BRAKE FLUID

• Brake fluids are used to transfer force into
  pressure .It works because liquids are
  incompressibe.
• 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
  mineral oil and silicone based fluids .

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MASTER CYLINDER

• ?The master cylinder is the heart of the brakes
  hydraulic system.
• ?It converts the force exerted on the brakes
  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 exerts 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
  wheel and applies the brakes.

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QUESTIONS
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