What is Hydraulic Braking System

Construction and Working of Hydraulic Brake:

The main component of hydraulic brakes system are as under:

1. Brake pedal

2. Fluid reservoir

3. Master cylinder

4. Wheel cylinder

Hydraulic Braking System
Hydraulic Braking System

Functions of the Hydraulic Braking System:

  • Hydraulic brake generates very high force compare the mechanical braking.
  • The final braking is quick and effective, that’s why it’s used on high-performance vehicles.
  • Frictional wear and tear that occurs in the mechanical braking system are much reduced to an optimum level in the hydraulic braking system.
  • The hydraulic braking system is very easy to fix due to its less complexity compared to mechanical brakes.

Construction of Hydraulic Braking System:

The figure shows a hydraulic brake system with a component master cylinder and wheel cylinder. The master cylinder is connected by tubing to the wheel cylinder at each of four wheels. The system is filled with liquid under light pressure when the brakes are not in operation.

The liquid I known as brake fluid, and is usually a mixture of glycerine and alcohol or castor oil and some additives etc.

Each wheel brake consists of a cylinder brake drum which is mounted on the inner side of the wheel and revolves with it and two brake shoes, which are mounted inside the brake drum and do not rotate. 

The shoes are fitted with heat and wear-resistant brake lining on the surfaces. The brake pedal is connected to the master cylinder piston by means of a piston rod.

Working principle of Hydraulic Braking System:

To bring vehicle stop, its kinetic energy must be changed into heat energy. The amount of pedal pressure is approximately 20 to 40 kg. to transmit the pedal pressure equally to each wheel, pascal’s law is applied.

When the brakes are to be applied, the driver depresses the pedal, the piston is forced into the master cylinder, thus increasing the pressure of the fluid in the master cylinder and in the entire hydraulic system. 

This pressure is connected instantaneously to the wheel cylinder on each of the four brakes when it forces the wheel cylinder piston upwards. This piston is turned, force the brake shoes out against the brake drum. Thus the brakes are applied.

When the driver releases the brake pedal, the master cylinder piston returns to its original position due to the return spring pressure, and thus the fluid pressure in the entire system drops to its original low value, which allows retracting spring on wheel brakes to pull the brakes shoes out of contact with the brake drum into their original positions. 

This causes the wheel cylinder piston also to come back to its original inward position. Thus, brakes are released.

 Advantages of Hydraulic brake system:

1. High mechanical advantage.

2. System provides an equal braking effect on all wheels.

3. Wearing of parts is negligible.

4. Leg foot pressure is required for stopping the vehicle.

5. System is self-compensating.

Disadvantages Hydraulic brake system:

1. The braking system fails, if there is any leakage in the brake lines.

2. The brake shoes are liable to get ruined if the brake fluid leaks out.

3. The system is costlier than the mechanical brake system.

Also Read: Hydraulic Intensifier

What is Hydraulic Braking System What is Hydraulic Braking System Reviewed by Harish on March 12, 2021 Rating: 5

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