HYDRAULIC BRAKING SYSTEM

Presented by:Sujan kharel

Ansal university (B.tech (ME),4th sem,2015)

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.

HISTORY: In 1918 Malcolm lockheed develops a

hydraulic brake system

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.

On the basis of Action on Front or Rear WheelsFront-wheel brakesRear wheel brakes

On the basis of method of application of Braking contact

Internally – expanding brakesExternally – contracting brakes

PRINCIPLES OF HYDRAULIC BRAKINGHydraulic brakes work on the principle of

Pascal’s 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.

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 .

MASTER CYLINDERThe master cylinder is the heart of the brake’s

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.

QUESTIONS