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 The technology of controlling pressurized fluids to
create
 force and motion is known as Hydraulics .
HYDRAULIC PRINCIPLES:
 Fluids cannot be compressed
 Fluids can transmit Movement
• Acts “Like a steel rod” in a closed container
• Master cylinder transmits fluid to wheel cylinder or
• caliper piston bore.
 Fluids can transmit and increase force
PRESSURE =FORCE / AREA
Of course ,the final contact between vehicle and road made through tyres
-hence it is of great importance in braking system.
Bald or defective tyres will even make the best brakes ineffective.
The braking systems which works with the help of hydraulic
principles is known as hydraulic braking systems.
HYRAULIC BRAKING SYSTEM CAN BE OPERATED BY
Vacuum, Hydro or Motor assisted
Disc System
Drum System
Dual System
DRUM BRAKE
MASTER
CYLINDER
DISK BRAKE
BRAKE PEDAL
HYDRAULIC PRESSURE IS DISTRIBUTED EQUALLY IN ALL DIRECTIONS
BY THE SAME PRINCIPLE ……….
SAME LINE OF PRESSURE WILL BE EXERTED ON ALL WHEELS
The Hydraulic pressure is the same, but the applied force can
be changed by the piston size.
Expanding shoes create force on the inner surface of the drum
Used on the rear of some trucks and SUV’s
Self-energizing design requires less activation force
Require periodic adjustment
DISK BRAKES WORKS WITH THE HELP OF CALIPERS
FIXED CALIPERS
Calipers are disc brakes that use a caliper that is FIXED
in position and does not slide.
-They have pistons on both sides of the disc.
-There may be 2 or 4 pistons per caliper
FLOATING CALIPERS
-Much more common
-Single Piston
-Easier to work with
-On “inboard” side of caliper
Calipers are of two types
Applies two pistons to opposite sides of rotor
Caliper stays stationary
Disc Brakes require higher hydraulic pressure
-Motorcycles and some import trucks and cars use this
type
-Similar to bicycle brakes
.Applies pressure to two pads on opposite sides
of rotor
.Caliper
-Sliding
-Fixed
.Friction Material exposed to air
THIS CONDITION WILL OCCUR IF THERE IS MORE FRONT BRAKE TORQUE
THAN DYNAMIC FRONT WEIGHT
THIS CONDITION WILL OCCUR IF THERE IS MORE REAR TORQUE THAN
DYNAMIC REAR WEIGHT
Optimum braking is achieved when brake torque distribution matches
dynamic weight distribution
TO ACHIEVE THIS CONDITION PROPORTIONATING VALVES ARE USED
When a vehicle brakes , weight is transferred to the front.the nose will
dip as it gets heavier and rear will rise as it gets lighter.The rear needs less
hydraulic pressure.
Proportionating valves are used to provide balanced braking
by reducing hydraulic pressure to rear wheel
When a large variation at axle loading takes place, such as railway wagons ,
trucks ,load or height sensitive proportionating valves regulate more hydraulic
pressure to the rear axle in the amount needed.
Some vehicles with front/ rear split braking systems have a proportionating
valve by-pass which allows full pressure to rear axle if front brakes fails.
Properties of Brake Fluid
Does not thicken or then with changing heat
Must not boil
Must be compatible with brake parts material
Must lubricate internal parts
Must not evaporate easily
The fluid through which the energy is passed in hydraulic braking systems is
known as BRAKE FLUID
Hydraulic braking systems

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Hydraulic braking systems

  • 1.
  • 2.  The technology of controlling pressurized fluids to create  force and motion is known as Hydraulics . HYDRAULIC PRINCIPLES:  Fluids cannot be compressed  Fluids can transmit Movement • Acts “Like a steel rod” in a closed container • Master cylinder transmits fluid to wheel cylinder or • caliper piston bore.  Fluids can transmit and increase force PRESSURE =FORCE / AREA
  • 3.
  • 4. Of course ,the final contact between vehicle and road made through tyres -hence it is of great importance in braking system. Bald or defective tyres will even make the best brakes ineffective. The braking systems which works with the help of hydraulic principles is known as hydraulic braking systems.
  • 5. HYRAULIC BRAKING SYSTEM CAN BE OPERATED BY Vacuum, Hydro or Motor assisted Disc System Drum System Dual System
  • 7. HYDRAULIC PRESSURE IS DISTRIBUTED EQUALLY IN ALL DIRECTIONS BY THE SAME PRINCIPLE ……….
  • 8. SAME LINE OF PRESSURE WILL BE EXERTED ON ALL WHEELS
  • 9. The Hydraulic pressure is the same, but the applied force can be changed by the piston size.
  • 10. Expanding shoes create force on the inner surface of the drum Used on the rear of some trucks and SUV’s Self-energizing design requires less activation force Require periodic adjustment
  • 11.
  • 12. DISK BRAKES WORKS WITH THE HELP OF CALIPERS
  • 13. FIXED CALIPERS Calipers are disc brakes that use a caliper that is FIXED in position and does not slide. -They have pistons on both sides of the disc. -There may be 2 or 4 pistons per caliper FLOATING CALIPERS -Much more common -Single Piston -Easier to work with -On “inboard” side of caliper Calipers are of two types
  • 14. Applies two pistons to opposite sides of rotor Caliper stays stationary Disc Brakes require higher hydraulic pressure -Motorcycles and some import trucks and cars use this type -Similar to bicycle brakes
  • 15. .Applies pressure to two pads on opposite sides of rotor .Caliper -Sliding -Fixed .Friction Material exposed to air
  • 16.
  • 17. THIS CONDITION WILL OCCUR IF THERE IS MORE FRONT BRAKE TORQUE THAN DYNAMIC FRONT WEIGHT THIS CONDITION WILL OCCUR IF THERE IS MORE REAR TORQUE THAN DYNAMIC REAR WEIGHT
  • 18. Optimum braking is achieved when brake torque distribution matches dynamic weight distribution TO ACHIEVE THIS CONDITION PROPORTIONATING VALVES ARE USED When a vehicle brakes , weight is transferred to the front.the nose will dip as it gets heavier and rear will rise as it gets lighter.The rear needs less hydraulic pressure. Proportionating valves are used to provide balanced braking by reducing hydraulic pressure to rear wheel
  • 19. When a large variation at axle loading takes place, such as railway wagons , trucks ,load or height sensitive proportionating valves regulate more hydraulic pressure to the rear axle in the amount needed. Some vehicles with front/ rear split braking systems have a proportionating valve by-pass which allows full pressure to rear axle if front brakes fails.
  • 20. Properties of Brake Fluid Does not thicken or then with changing heat Must not boil Must be compatible with brake parts material Must lubricate internal parts Must not evaporate easily The fluid through which the energy is passed in hydraulic braking systems is known as BRAKE FLUID