Did you ever wonder how just pressing a brake pedal can stop a car!!?? If you don’t then you must know brake hydraulics. If you don’t know brake hydraulics then let me tell you through this post.
The important parts in the breaking mechanism are master cylinders and sleeve cylinders. Let’s talk about master cylinder.
There are two pistons and two sleeves inside the master cylinder. It also has sensors that trigger a warning light when the brake fluid gets low.when you press the brake pedal the master cylinder get into action by pushing the primary piston.pressure builds in the cylinder and lines as the brake pedal is depressed further. The pressure between the primary and secondary piston forces the secondary piston to compress the fluid in the circuit, forcing fluid along the pipes.The fluid travels to slave cylinders at each wheel and fills them, forcing pistons out to apply the brakes. If brakes are working properly the pressure will be same in both circuits.
The master cylinder transmits hydraulic pressure to the slave cylinder when the pedal is pressed.
The combined surface ‘pushing’ area of all the slave pistons is much greater than that of the piston in the master cylinder.
Consequently, the master piston has to travel several inches to move the slave pistons the fraction of an inch it takes to apply the brakes.
Most modern cars are fitted with twin hydraulic circuits, with two master cylinders, in case one should fail.
Sometimes one circuit works the front brakes and one the rear brakes, or each circuit works both front brakes and one of the rear brakes or one circuit works all four brakes and the other the front ones only.
Under heavy braking, so much weight may come off the rear wheels that they lock, possibly causing a dangerous skid. For this reason, the rear brakes are deliberately made less powerful than the front.