What is the principle of hydraulic brake system?

Answer 1

PRINCIPLES OF HYDRAULIC PRESSURE A Frenchman named Pascal discovered that a pressure applied to any part of a confined fluid transmits to every other part with no loss. The pressure acts with equal force on all equal areas of the confining walls and perpendicular to the walls. Remember when you are talking about the hydraulic machine, you are talking about the way a liquid acts in a closed system of pipes and cylinders. The action of a liquid under such conditions is somewhat different from its behavior in open containers or in lakes, rivers, or oceans. You also should keep in mind that you cannot compress most liquids into a smaller space. Liquids don't "give" the way air does when you apply pressure, nor do liquids expand when you remove pressure. Punch a hole in a tube of toothpaste. If you push down at any point on the tube, the toothpaste comes out of the hole. Your force has transmitted from one place to another through the toothpaste, which is a thick, liquid fluid. Figure 10-5 shows what would happen if you punched four holes in the tube. If you were to press on the tube at one point, the toothpaste would come out of all four holes. You have illustrated a basic principle of hydraulic machines. That is, a force applied on a liquid transmits equally in every direction to all parts of the container. We use this principle in the operation of four-wheel hydraulic automobile brakes. Figure 10-6 is a simplified drawing of this brake system. You push down on the brake pedal and force the piston in the master cylinder against the fluid in that cylinder. This push sets up a pressure on the fluid as your finger did on the toothpaste in the tube. The pressure on the fluid in the master cylinder transmits through the lines to the brake cylinders in each wheel. This fluid under pressure Figure 10-6.-Hydraulic brakes. Figure 10-7.-Liquid transmits force. pushes against the pistons in each of the brake cylinders and forces the brake shoes out against the drums. MECHANICAL ADVANTAGES OF HYDRAULIC PRESSURE Another aspect to understand about hydraulic machines is the relationship between the force you apply and the result you get. Figure 10-7 will help you understand this principle. The U-shaped tube has a cross-sectional area of 1 square inch. In each arm is a piston that fits snugly, but can move up and down. If you place a 1-pound weight on one piston, the other one will push out the top of its arm immediately.
The master cylinder is where the brake fluid starts.

The pedal is attached to the master cylinder plunger. When the pedal is depressed

it pushed the plunger which pushes the brake fluid down the brake lines.

the brake lines are connected to the slave cylinders. when the brake fluid reaches the slave cylinders it presses out a piston to which is attached a brake pad. The brake pad then clamps against the rotor.

All air must be bled from the system. (Air is compressible and if you have any in the system you will have a soft pedal.)

As oil is virtually uncompressable it works as a solid link from pedal to brake.
hudraulic brake system is a composition master cylinder,caliper cylinder,resorvoir,high pressure pipe lines brake pads etc.

while applying brake pedal the hydaraulic pressure comes through reservoir to mastercylinder to primary cup(including piston) and pressure goes to the caliper cylinder primary piston and thus barke pads grabs the disc and thier is heavy heat energy builds,

finally stops the wheel.

during releasing the br pedal the hydraulic pressure line returns through 2dary cup(including piston),returning the brake oil to the reservoir and thus releasing the brake