how does nitrogen enter the braking system？

The brake works under hydraulic pressure. If the brake system is unable to build up the pressure needed to operate the system, your pedal will feel strange. In some cases, it will be floppy. In other cases, the brake must be applied.

When the brake pedal is depressed, the master cylinder delivers fluid to the lines, which creates pressure. This activates the caliper, which squeezes the rotor on each wheel between the brake pads. Drum brakes work similarly, but the hydraulic pressure causes the actuator to press the brake shoes against the sides of the drum, which slows the wheels down.

It is important to note that it can be extremely dangerous if air (consisting mostly of oxygen and nitrogen) enters the hydraulic system.

Why are air bubbles dangerous in a hydraulic brake system?

How about a solution?

Why are air bubbles dangerous in a hydraulic brake system?

In a hydraulic braking system, it is most important that the fluid be a non-compressible fluid. If the assumption is that there are air bubbles in the brake line. Air has compressible properties and if there is enough air in the brake line, a fully depressed brake pedal will not transfer all the pressure to the caliper. Thus, a few cubic centimeters of air in the brake system counteracts a few centimeters of brake pedal travel. You will feel the soft brake pedal slide all the way to the floor.

Eventually, the efficiency of the braking system will decrease and the wheels will not be able to obtain the required braking force. As a result, the braking distance will increase. If you assume that you have to stop the vehicle at 100 m from a reference point and that there is an obstacle at 150 m. As a result, the vehicle has a higher probability of colliding with the obstacle due to inefficient braking

This problem can be eliminated by brake bleeding (the process of removing air bubbles from the brake lines). After the brakes are bled, the pedal will become difficult to depress, which will clearly indicate a good braking system.

How about a solution?

Brake fluid is trapped in a sealed, airtight container at the top of the master cylinder. As the brake fluid level drops, air enters to fill the void. Wait a minute - didn't we just say the system was air tight? Unfortunately, over time, air does get into the reservoir and eventually into the rest of the brake system, including your brake lines. Every time you open the cap to check the brake fluid level, you are allowing air into the system. When the fluid is at the correct level, the air is not a major factor. However, the more the brake pads wear, the more the voids will grow. This is one of the reasons why it is so important to keep the fluid at the proper level.

Water can actually cause braking problems as well. Water can actually cause air to build up in your brake lines. How do you ask? Well, brake fluid is hygroscopic - it absorbs and retains water. The problem occurs when the fluid absorbs as much water as possible - it becomes saturated. Brake fluid has an extremely high boiling point; however, if you apply excessive braking to your vehicle (for example, traveling over a mountain), it can easily heat up to that temperature or higher. When brake fluid boils - especially if there is too much water in the system - steam is a byproduct. The brake system eventually compresses the vapor and converts it into water. The air separates from the water, and without realizing it, you have large bags of air in your brake lines.

A loose brake pedal is bad news, but there's no need to lose any sleep over it. You may not need a complete brake overhaul. Similar to other brake problems, all you need to do is fix the situation immediately. Brakes are one of the most critical safety components on your vehicle. Obviously, your safety and the safety of other drivers is at risk through poor quality braking systems. So, what can you do? It is certain that after bleeding your brakes, your brake system will function properly. This simple step will remove excess air from the lines and restore your brake pedal pressure. You can do this at home in your garage, or you can take your vehicle to your local auto store to have it done for you. While using it, you should probably change the fluid as well. As mentioned earlier, brake fluid can become saturated and deteriorate over time, so change it when you have the opportunity. With new brake pads, all new brake fluid and proper exhaust hydraulics, your brakes should be as strong and solid as new.

conclusion

If air has entered inside your brake system, don't panic, follow the steps we have described. If you can't handle it, feel free to contact us!