How do I change my car s brake fluid? How to change car brake fluid?

You don't need to know how to change the brake fluid, you just need to go to the car dealership to change the brake fluid, and it is not a big deal to spend a little money.

Start by placing the vehicle on a trench or lifting it with a lift. One person under the car, remove the rubber dust cap on the oil drain, install the two ends of the prepared transparent hose in the oil drain port and waste oil collection bottle respectively, and then use a wrench to loosen the oil port screw in the counterclockwise direction, and at the same time the person in the car repeatedly presses the brake pedal. At this time, the brake fluid will be sprayed out of the oil drain, and the liquid level in the brake fluid reservoir should be added as the fluid level drops.

Tighten the oil drain screw after the oil is clear.

Then the person in the car repeatedly steps on the brake pedal to the highest point and steps on the brake pedal without letting go, and the person under the car loosens the screw of the oil port, and tightens it after the brake oil is sprayed clean and notifies the person in the car to let go. Repeat this several times until there are no bubbles in the released brake fluid. The idea is that the liquid level in the brake fluid reservoir should be added as the fluid level drops.

Then go to another round and repeat the steps 1 3 above.

The order of replacing the brake fluid should be far and then near, that is, starting from the far end of the brake line, then the wheel, and then the front wheel. If you are particularly concerned, because the brake line is an "X" layout, in order to avoid the mixing of new and old oil, the oil change and deflation can start from the left rear or right rear, such as the first left rear wheel, the next right front wheel, then the right rear wheel, and finally the left front wheel. After the last four wheels are replaced, the road test, if you find that the brake is soft and not sensitive, please repeat step 3 for deflation operation, and the order is carried out in accordance with step 5.

The idea is that the liquid level in the brake fluid reservoir should be added as the fluid level drops.

Automotive brake fluid is used in automotive hydraulic braking systems, when the fluid is pressurized, it will quickly and evenly transmit the pressure to all parts of the car body. The hydraulic braking system works using this principle. The quality of brake fluid directly affects the driving safety of automobiles, and foreign countries attach great importance to automobile brake fluids and regard brake fluids as safety oils.

There are three types of brake fluids: synthetic, alcohol, and mineral. Among them, the synthetic type is divided into -1 (for trucks) and 4604 (for cars); Alcohol-type brake fluid can not meet the requirements of vehicles in severe cold or hot areas, and the driving safety is poor, so it can be used for domestic old-fashioned cars. Mineral brake fluid has good lubrication and no corrosion, but it has a swelling effect on rubber, and the braking system needs to be replaced with oil-resistant rubber parts when used.

The No. 7 mineral oil brake fluid can be used in severe cold areas. The new brake fluid developed by domestic refineries is classified as JC0, JC1, JC2, JC3, JC4 and JC5 six grades, the larger the serial number, the higher the boiling point, the better the high temperature gas resistance, and the higher the braking safety.

If you want to replenish or replace the brake fluid, first open the brake master cylinder reservoir cover and check if the brake fluid is within the max-min line. If it is lower than the min line, or even worse, the joints of the brake line should be checked once to see if there is any leakage. If there is a leak, it should be repaired immediately, or it should be repaired by a specialized repair department.

If the brake fluid is within the normal range, it can be replenished by adding oil to max. When refueling, pour slowly and slowly to prevent foaming (if air bubbles enter the brake line, it will affect the braking effect). The general replacement interval for brake fluid is two years.

It is important to note that the brake fluid applied must comply with the manufacturer's regulations. Be careful not to stick the brake fluid on the body paint when filling, because the brake fluid is very corrosive to the paint. The brake fluid is mostly alcohol ether and has strong hygroscopicity, therefore, in addition to using unopened new brake fluid when filling, it is necessary to avoid opening the lid of the reservoir tank for a long time, so as not to easily reduce the boiling point after the brake fluid absorbs water, thus forming gas resistance and affecting the braking effect.

Checking your brake fluid is important for safe driving, especially before running long distances.

Three kinds. They are castor oil-alcohol type, synthetic type, and mineral oil type.

1. Castor oil-alcohol type: It is made of 45%-55% refined castor oil and 55%-45% low carbon alcohol (ethanol or butanol), and is precipitated to obtain a colorless or light yellow clear and transparent liquid, that is, alcohol-type automobile brake fluid. Castor oil plus ethanol is alcohol type No. 1, and castor oil plus butanol is alcohol type No. 3.

The raw materials of alcohol-type brake fluid are easy to obtain, the synthesis process is simple, and the product has good lubricity; The disadvantage is that the boiling point is low and the properties are unstable at low temperatures. Ethanol vapor appears above 45 °C in alcohol type 1, resulting in gas resistance; At -25 °C, castor oil precipitates as a milky white gelatinous substance, and increases with the decrease of temperature, blocking the braking system and making the braking system fail heavily.

2. Synthetic type: made of ether, alcohol, ester and other additives mixed with lubrication, anti-oxidation, anti-rust, anti-rubber swelling and other additives.

3. Mineral oil type: made by adding thickeners and other additives to the refined light diesel oil fraction.

The method of replacing the brake fluid is: 1. Turn off the vehicle, open the engine compartment cover, use a syringe to pump out the oil in the oil storage tank, and pump it to the bottom of the tank; 2. Fill the oil pot with new brake fluid; 3. Use a jack to jack up the vehicle, starting from the rear wheel, and remove the tire; 4. Find the oil drain screw of the brake cylinder and remove the rubber dust cap on it; 5. Use a wrench to loosen the oil drain screw, put the rubber tube on it, and connect the other end to the oil drain bottle; 6. Go to the car and start to step on the brakes, if you find that the rubber pipe is discharged from the shallow new oil, the oil change of this wheel has been completed, stop stepping on the brakes, install the tires, and repeat the operation for the next three tires; 7. After all four wheels are discharged, observe whether the oil volume of the oil storage tank in the engine compartment has reached the lower limit, and if it reaches the end, new brake oil can be added appropriately.

The method of replacing the brake fluid is: 1. Turn off the vehicle, open the engine compartment cover, use a syringe to pump out the oil in the oil storage tank, and pump it to the bottom of the tank; 2. Fill the oil pot with new brake fluid; 3. Use a jack to jack up the vehicle, starting from the rear wheel, and remove the tire; 4. Find the oil drain screw of the brake cylinder and remove the rubber dust cap on it; 5. Use a wrench to loosen the oil drain screw, put the rubber tube on it, and connect the other end to the oil drain bottle; 6. Go to the car and start to step on the brakes, if you find that the rubber pipe is discharged from the shallow new oil, the oil change of this wheel has been completed, stop stepping on the brakes, install the tires, and repeat the operation for the next three tires; 7. After all four wheels are discharged, observe whether the oil volume of the oil storage tank in the engine compartment has reached the lower limit, and if it reaches the end, new brake oil can be added appropriately.

1. First of all, put the vehicle in a state of ignition, and open the lid of the brake fluid, and use a syringe to pull out all the brake fluid in it until it reaches the bottom of the tank.

2. Then pour the new brake fluid into the fuel tank (1-2L), as for how many liters to fill, it depends on the capacity of the oil tank.

3. Use a lift to lift the bottom of the car, or you can use a jack.

4. Then find the oil drain screw of the brake cylinder and remove the dust cap on the oil drain buckle.

5. Use a wrench to loosen the oil drain screw, put the rubber tube on it, and connect the other end to the oil drain bottle;

6. At this time, you can start to step on the brakes, you need to pay attention to the color of the brake fluid in the rubber hose, if the color is still relatively dark, it proves that the old brake fluid has not been drained. If the color is lighter, it means that the tire has completed the oil change, stop pressing the brakes and install the screws and dust cap back (the other three tires also do this). But in this process, it is best for one person to apply the brakes and the other to observe the color, so as not to accidentally drain all the oil in the oil can, causing air to enter the brake system.

7. Finally, you need to observe the position of the liquid level of the brake fluid, if it is lower than the minimum scale line, you also need to replenish the brake fluid.

Automobile brake fluid replacement needs to be poured from the master cylinder and discharged from the four brake cylinders to be completely replaced.

The method of replacing the brake fluid is: 1. Turn off the vehicle, open the engine compartment cover, use a syringe to pump out the oil in the oil storage tank, and pump it to the bottom of the tank; 2. Fill the oil pot with new brake fluid; 3. Use a jack to jack up the vehicle, starting from the rear wheel, and remove the tire; 4. Find the oil drain screw of the brake cylinder and remove the rubber dust cap on it; 5. Use a wrench to loosen the oil drain screw, put the rubber tube on it, and connect the other end to the oil drain bottle; 6. Go to the car and start to step on the brakes, if you find that the rubber pipe is discharged from the shallow new oil, the oil change of this wheel has been completed, stop stepping on the brakes, install the tires, and repeat the operation for the next three tires; 7. After all four wheels are discharged, observe whether the oil volume of the oil storage tank in the engine compartment has reached the lower limit, and if it reaches the end, new brake oil can be added appropriately.

The braking working pressure of automobile brake fluid 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 liquid-filled line, it conducts the pressure quickly and evenly across all parts of the liquid. Below, I will share with you the method of replacing the brake fluid of the car, I hope it will be helpful to you!

1.Don't rush to add different types of brake fluid.

Because different types or different types of brake fluids are not allowed to be mixed, otherwise there will be delamination, loss of braking performance, and endanger driving safety.

2.Find out the cause of the oil shortage as soon as possible, and then deal with it according to different situations.

If the sealing element is damaged, it should be replaced with a new part in time; If the joint is loose, it should be tightened immediately; If the brake fluid is naturally lost, the same type of brake fluid should be filled.

3.If you do not carry it or cannot buy the same model as the original'When braking fluid, you should drain all the brake fluid left in the braking system, and then thoroughly clean the braking system with alcohol before adding new brake fluid.

4.If brake fluid is not available, it can be replaced with alcohol or liquor.

However, at this time, the braking effect of the locomotive amusing Lushu brake will decrease, so the locomotive should use low speed to drive, pay attention to control the speed, and do not brake urgently to ensure driving safety.

And should be collected as soon as possible, immediately after the car to release the substitutes, replaced with the model of the applicable brake fluid. Potato.

There are many ways to change the brake fluid, the previous dirt method was to lift the car with a lift, one person was responsible for applying the brakes in the cab, and one person was responsible for draining the oil from the brake cylinder of each wheel under the car. When you apply the brakes, open the dispensing screw of the pump and the brake fluid will be sprayed out. Drain the old brake fluid like this, add new oil to the brake oil pot in the cabin above, drain the old oil and the new oil will enter the pipeline, and wait until you see the color of the new oil, make a sub-cylinder, and then change the wheel and repeat.

This method is troublesome, and the pressure of the brake fluid is high when braking, so the brake fluid on the rear wheel is everywhere after draining.

The improved method is to put a hose on the deflation screw, put the oil pan below, loosen the exhaust screw, and the brake oil will flow out slowly. During this process, care should be taken to replenish the brake fluid to prevent air from entering the pipeline. This method is feasible, but it is not scientific to put four wheels at the same time.

The brake oil line of the rear wheels is longer than that of the front wheels, and the front wheel lines are shorter, and the brake oil preferentially flows out of the lines with low resistance, so the front and rear wheels can be used to drain the oil separately. After releasing the new oil, start the vehicle after tightening the exhaust screw, one person steps on the brake 5 times and then does not move, the other person loosens the exhaust screw and tightens it immediately, repeat 2 times per round, the exhaust is completed, and the brake fluid is also changed.

The method of further improvement is that by using vacuum suction, you can use an oil pump, a vacuum pump or a large syringe, first use a hose to pump out the old oil in the brake oil can, add new oil, use the exhaust screw hole of each sub-pump to carry out vacuum suction, the speed is fast, a sub-pump needs about 2 minutes to complete, the brake oil pot is filled with new oil, and after the completion of the four-wheel sub-cylinder, for the sake of safety, the exhaust operation of the brake is still carried out on the car for the sake of safety.

The more advanced oil change method is to use the brake oil change machine, or use the exhaust screw of the four-wheel sub-cylinder, use the machine's pipe to dock, the brake oil pot screw cap, and dock by the machine's filling pipe, so that the brake pipeline and oil changer become a closed system, and the oil dispenser injects new oil while sucking the old oil in the pump? Needless to say, the advantages are relatively high-grade, there is no leakage of oil, and its effect is practically unchanged from the first two.

Then whether it is suction or natural exile, the result is exactly the same, artificial oil discharge to observe the level of the brake oil pot in the process of old oil discharge, if insufficient must be replenished immediately, once the emptying is very troublesome, must be solved after multiple exhausts. Regarding the flow of brake fluid to metal parts and tires, you remember that you must rinse immediately. Is brake fluid highly absorbent?

That's right. Because it is soluble in water, it will disappear when rinsed with plenty of water, and if it is not rinsed, the brake fluid will have a corrosive effect on metal and paint. Of course, it is best to avoid direct contact with the human body as much as possible.