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BRAKING SYSTEM
Brakes are one of the most important control components of the vehicle. They contribute very much in the running and control the vehicle. The main important of this system to comfort not only for driver and passengers but other persons moving on the road.
FUNCTIONS OF BRAKES
To stop
To control speed
To hold stationary position
REUIREMENTS OF GOOD BRAKING SYSTEM
Stop distance
Jerk
Should not affected by water, heat, dust etc.
Weather
Wear & tear of lining
Minimum driver effort
CLASSIFICATION
Mechanical brakes
Internal expanding brakes
Disc brakes
Hand brakes
Hydraulic brakes
Power brakes
Air brakes
Air hydraulic brakes
vacuum brakes
Electric brakes
INTRODUCTION TO HYDRAULIC BRAKES
The brakes which are operated by means of hydraulic pressure are known as hydraulic brakes. The hydraulic brakes function on the principle of “PASCALS LAW ”
PASCALS LAW
“Pressure applied to a liquid is transmitted equally in all direction”
CHARACTERISTICS OF HYDRAULIC FLUIDS
Non compressible
Must remain as fluid at low temperature
Free from rust and corrosion
Must act as lubricant to moving parts
Should not soften rubber parts
COMPONENTS OF HBS
PEDAL
MASTER CYLINDER
PIPE LINE
WHEEL CYLINDER
BREAK SHOE & DRUM
ADVANTAGES
Equal braking effort to all four wheels.
The system is simple in construction.
Less rate of wear.
The system is mostly self-lubricating.
Flexibility in brake lines.
The hydraulic brakes can also provide different braking action between the front and rear brakes by using the wheel cylinder of different size for front and rear wheels.
DISADVANTAGES
Even slight leakage of air into the braking system makes it useless.
The brake shoes are liable to get ruined if the brake fluid leaks out.
This system is suitable only for applying brakes intermittently. For parking purpose separate mechanical linkage has to be employed.