After changing the brake fluid, the brakes became much softer than before, what s going on

One is caused by air inside, and there is a problem with your oil, I have changed Mobil's brake fluid before, it is very expensive, but the effect of replacing it is very bad, the brake pedal is too heavy, I can't step on it, and then I learned that there is a compatibility problem between the brake fluid and the vacuum pump.

Brake fluid is also known as brake fluid or brake fluid. Brake fluid made from refined diesel distillate thickeners and antioxidants. There are three types of mineral oil brake fluid, alcohol brake fluid and synthetic brake fluid.

When purchasing, you should choose a reliable manufacturer, and the higher the level, the better. Its braking working pressure is generally 2MPa, and the high can reach 4 5MPa.

All liquids are incompressible, and when the liquid is under pressure in a sealed container or in a line filled with liquid, the pressure is transmitted quickly and evenly to all parts of the liquid. Hydraulic brakes work using this principle.

High-temperature gas resistance is unqualified, and the high temperature gas resistance includes two indicators, the reflux boiling point and the wet boiling point, which control the high temperature boiling point of the brake fluid and the wet boiling point after water infiltration, respectively.

The braking force of the car is transmitted through the brake fluid, so the presence of air resistance in the brake fluid will lead to the lag or even failure of the braking force transmission. Among the 12 batches of unqualified products in this random inspection, none of the high-temperature gas resistance indicators were qualified.

Sport viscosity is unqualified, and kinematic viscosity is a requirement for brake fluid to have appropriate viscosity under high or low temperature climatic conditions.

It specifies the viscosity of the brake fluid at and 100. Failure to meet the requirements will result in wear and tear of the braking system or poor transmission.

Hello, just vent the air.

changeBrake fluidAfter 95 percent of the brakes become softer, the reason:

1. In the process of changing the brake fluid, air enters the oil pipe.

2. The brake fluid is in a high-temperature working state for a long time, resulting in bubbles. Brake fluid is also known as:Brake fluidAs a medium for braking force transmission in the braking system of automobiles, because of its incompressibility, it can directly transmit the pressure output of the brake master cylinder to the brake cylinder.

The boiling point of brake fluid is higher than that of water, and the temperature will continue to rise when the brake fluid is in a high-temperature working state for a long time.

If the brake fluid is used for too long, a lot of bubbles will be produced when it is close to the boiling point, and the air resistance generated during braking will affect the braking effect, and even cause the brake to fail directly.

Because there is air in it, or because I have changed the brake fluid that is not effective before, the brake pedal is too heavy and I can't step on it, and I later learned that there is a compatibility problem between the brake fluid and the vacuum pump.

Because the seal in the brake system is a rubber leather wrist, long-term immersion in the brake fluid will undergo chemical changes, causing the leather wrist to expand or contract, thereby affecting the braking performance, so the brake fluid with good compatibility with rubber should be selected.

The ability of brake fluid to resist air resistance at high temperature is examined by the index of "balanced reflux point", the higher the equilibrium reflux point of a brake fluid, the better its high temperature performance, and the higher its quality level.

It should be that when the brake fluid is replaced, the brake oil pipe is caused by air ingress, and the air needs to be exhausted. It is also possible that the brake pump is broken or the ABS pump enters the air when changing the brake fluid, and the pump needs to be turned on by the computer, and the speed is lifted to step on the brake several times when driving, and the ABS is exhausted after starting several times, it is recommended to go to the repair shop to deal with it.

The braking system of ordinary civilian vehicles is actually a hydraulic system, and theoretically any liquid that is not easy to be compressed can be used as a medium to transmit force (the role of brake fluid). However, due to the actual use, especially the friction between the brake pads and the brake disc during braking, a large amount of heat is generated, which is transferred to the brake fluid through the brake cylinder, which eventually leads to a high temperature of the brake fluid near the cylinder.

At present, DOT4 brake fluid can fully withstand the test of high temperatures, but the water in the brake fluid is not. When the brake fluid is at high temperatures, the water in the oil line will vaporize to form a compressible gas, which exists in an irregular position and quantity in the brake line. The size and number of gases vary depending on the temperature.

Regularly check the thickness of brake pads and brake discs, and replace them when they reach the wear limit. In addition, the smoother the surface of the brake disc, the greater the area in contact with the brake pads, and the better the braking effect. As the thickness of brake pads and brake discs becomes thinner, the level of brake fluid will continue to drop.

In addition, the tire can not be ignored, regularly check the tire pressure, tread depth, the left and right tire pressure is not consistent with the cavity will lead to brake deviation, tread depth below the wear limit will increase the braking distance.

Hello, this problem is the cause of brake fluid. Because the brake fluid should have a high boiling point and a low condensation point. If the boiling point is not high, it is easy to cause bubbles in the brake fluid due to the frequent use of brakes, when you step on the brakes, the push rod and piston of the brake master cylinder squeeze the brake oil to the cylinder, and because the liquid is incompressible, so when the cylinder sticks the brake pads to the brake disc, you can no longer press the brake pedal down.

And when there are air bubbles in the brake fluid, there is a process of squeezing the air bubbles after the brake pads stick to the brake disc, so it will feel softer.

Just changing the good brake fluid and re-emptying it will solve the problem.

There may be a problem with the oil or the brake pads are not running in well.

<> "Many trouser owners find that after replacing the brake fluid in the car's braking system, they will encounter the phenomenon that the vehicle's brakes become softer. So the question is, what happens when you change the brake fluid and the brakes become softer?

The reason why the brakes become soft after changing the brake fluid is likely to be because the quality of the brake fluid is not good, or the air in it is still not discharged after changing the brake fluid.

In addition, in order to avoid the brakes becoming soft after changing the brake fluid, you should choose the brake fluid within the shelf life when changing the brake fluid, and avoid splashing other substances when changing the brake fluid, so that the brake fluid is not pure.

Automobile brake fluid in the braking system, mainly play a lubricating effect, so when the brake fluid is insufficient or deteriorated, the owner needs to add or replace the new car brake fluid in time. If the brake fluid is insufficient and is not added in time, or the brake fluid deteriorates and is not replaced, the internal parts of the automobile brake system are easy to wear out, which will directly affect the normal performance of the brake system.