Automobile

Principle of hydraulic brake system and how its works

Hydraulic brake system is one of the common and useful braking system used in modern vehicles. It is operated by foot pedal that connects all the four wheels with an additional hand brake operated mechanically on the rear wheels. The hydraulic fluid exerts equal pressure everywhere in its circuit. For this reason equal braking effort is obtained at all the four wheels. hydraulic brake is simple in construction, because it has no brake rod and It uses pipelines to transfer fluid which can be bent and shaped according to the underside of the body structure of a vehicle. And level of ware is very less in hydraulic brakes due to it absence of joints. The hydraulic brake is said to be reliable and easy to handle.

Layout of hydraulic brake system and its connection to all the vehicle’s wheels

At the end of this article, you’ll get to know the principle of hydraulic brake system, its components, master cylinder and how its works.

Component of hydraulic braking system contain master cylinder which includes reservoir for brake fluid as it part. The braking operation is carried out when the brake pedal is pressed. All braking system are designed in a way that a pipeline is connected to all the vehicle’s wheels cylinder which enables the wheel to eventually stop when the brake pedal is pressed. A pressure of 50pa is maintained in the pipeline to keep the cups in the wheel cylinder always on released position.

As mentioned earlier master cylinder is major part of hydraulic brake system. It serves as a piston cylinder device that contains fluid. The piston moved inside the cylinder by the push rod when brake is applied. This process build up pressure which allows the hydraulic fluid to be forced into the pipes under pressure. The fluid move inside the wheels where a small piston cylinder is arranged. This is known as caliper. These high pressure oil pushes the piston pads towards the drum thereby applying the brakes effectively

Fig shows how hydraulic braking system works from the brake pedal to the wheels

How Master cylinder works

Master cylinder as the heat of hydraulic braking system has two chambers. The upper one is known as compression chamber which controls the piston. The fluid in the reservoir satisfy changes in the fluid volume in the pipeline due to oil leakage and temperature variation. The master cylinder is designed with a rubber seal at both end of the piston. While a rubber boot covers the push covers the push rod at end of the master cylinder to prevent dirt from entering. The compression chamber has a brake lines, fluid check valve and a rubber cup inside. These help to keep the residual pressure in the brake line even when brake is released. There are two holes that connect reservoir and the combustion chamber. The first hole is a smaller one known as bypass while the second hole is know as intake port. The push rod is operated by the brake pedal. It moved immediately the pedal is pressed. The push rod move the piston left against the force of the spring till it close the by-pass port. Continuous movement of the of the push rod causes building up of pressure in compression chamber. These sufficient pressure allows the inner rubber cup of the fluid check valve deflected, forcing the fluid under pressure in the lines. This fluid enters the wheel applying brakes.

I hopefully believe you now understand hydraulic braking system and how its works. Well you can ask questions if you have any or for basic understanding you can watch video uploaded below. Please don’t forget to share this article… Thanks for reading!

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