How to bleed air from brake fluid
In car maintenance, the maintenance of the brake system is very important, and brake fluid degassing is one of the key operations. Air entering the brake system will cause brake failure or reduced braking effect, so regularly bleeding the air is an important step to ensure driving safety. This article will introduce in detail the methods, steps and precautions for venting brake fluid, and attach relevant data for reference.
1. The necessity of venting air from brake fluid
Brake oil (brake fluid) transmits pressure in the brake system. If air is mixed in the system, the brake pedal will become softer, the braking distance will be longer, or even completely ineffective. Therefore, air bleeding is a link that cannot be ignored in brake system maintenance.
| Problem phenomenon | Possible reasons |
|---|---|
| Brake pedal becomes soft | There is air in the brake system |
| Braking distance becomes longer | Insufficient brake fluid or air mixed in |
| Brake pedal sinks | Brake fluid leaks or air enters |
2. Preparation of Tools for Bleeding Air from Brake Oil
Before you start bleeding air, you'll need the following tools and materials:
| Tools/Materials | Purpose |
|---|---|
| brake fluid | Replenish or replace brake fluid |
| Air exhaust hose | Connect oil drain screw |
| transparent container | Collect old brake fluid |
| wrench | Loosen the oil drain screw |
| Assistant | Assist with braking pedal |
3. Steps to Bleed Air from Brake Fluid
The following are detailed steps for bleeding brake fluid:
| steps | Operating Instructions |
|---|---|
| 1. Check the brake fluid level | Make sure the fluid level in the brake fluid reservoir is between MAX and MIN |
| 2. Clean the oil drain screw | Clean the dirt around the oil drain screw to avoid contamination |
| 3. Connect the air exhaust hose | Connect one end of the hose to the oil drain screw, and put the other end into a transparent container |
| 4. Loosen the oil drain screw | Use a wrench to loosen the oil drain screw and start to bleed the air |
| 5. Press the brake pedal | The assistant depresses the brake pedal and holds it, tightens the oil drain screw and then releases the pedal. |
| 6. Repeat the operation | Repeat steps 4-5 until the discharged brake fluid is free of bubbles |
| 7. Check the fluid level | After air bleeding is completed, replenish the brake fluid to the normal level. |
4. Precautions
During the air exhaust process, you need to pay attention to the following points:
| Things to note | Description |
|---|---|
| Avoid brake fluid contact with skin | Brake fluid is corrosive, so wear gloves |
| Use the right brake fluid | Select the correct brake fluid model according to your vehicle manual |
| Exhaust air in sequence | Usually start with the wheel furthest from the brake master cylinder |
| Avoid air re-entry | Keep the fluid level in the brake oil bottle sufficient during the air bleeding process |
5. Frequently Asked Questions
The following are frequently asked questions and answers about brake fluid air bleeding:
| question | Answer |
|---|---|
| The brake pedal is still soft after bleeding the air | There may still be air remaining and the air needs to be exhausted again. |
| Brake fluid spurts out when air is exhausted | Check whether the oil drain screw is loose or damaged |
| Brake fluid turns black | It is recommended to replace the brake fluid to avoid affecting the braking effect. |
6. Summary
Bleeding air from brake oil is an important part of brake system maintenance. Correct operation can ensure braking performance and safety. Through the introduction of this article, you should have mastered the methods and precautions for exhausting air. If you are not familiar with the operation, it is recommended to seek help from a professional technician to ensure safe driving.
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