Removing air from a hydraulic clutch system is a critical step in ensuring proper clutch operation. The following are detailed methods and procedures for removing air from a hydraulic clutch system:

 I. Preparation for removing air from a hydraulic clutch system

1. Check the hydraulic fluid:

   - Ensure that there is sufficient oil in the clutch hydraulic fluid reservoir, and the level should be located between the specified ‘MAX’ and ‘MIN’ marks.

   - If the hydraulic fluid is insufficient, add it promptly.

2. Tool preparation:

   - Prepare tools such as spanners, plastic hoses, containers (for collecting outflow of hydraulic fluid), hose clamps, clean cloths, etc.

 Second, exhaust steps

 Method 1: manual exhaust method

1. Depress the clutch pedal:

   - Repeatedly depress the clutch pedal with your foot several times to circulate the hydraulic oil in the hydraulic system.   

2. Loosen the bleeder screw:

   - When the clutch pedal feels strong, use a spanner to loosen the bleeder screw of the booster or master cylinder.

3. Bleed:

   - At this point, hydraulic fluid will flow out of the bleeder screw, taking air out of the system.

   - Watch the hydraulic fluid flow out, when the hydraulic fluid flows continuously and does not contain air bubbles, it means that the air has basically been discharged.

4. Tighten the bleeder screw:

   - Tighten the bleeder screw, and then release the clutch pedal.

5. Repeat the procedure:

   - Repeat the above steps several times until it is confirmed that the air is completely discharged from the system.

 Method 2: Auxiliary Air Venting

1. Connect the hose:

   - Install a plastic hose on the bleeder valve of the working cylinder and connect the other end of the hose to a container with brake fluid.

2. Work in tandem:

   - Two people are required to work in tandem. One person slowly depresses the clutch pedal several times and holds it in place when resistance is felt; the other person loosens the bleeder valve until the brake fluid begins to flow out, then tightens the bleeder valve again.

3. Continuous operation:

   - Operate continuously several times according to the above method until there are no air bubbles in the flowing brake fluid.

 Method 3: Mechanical venting method (if necessary)

1. Use specialised equipment:

   - For some models, especially after the clutch pump replacement is very difficult to exhaust the situation, you can use mechanical exhaust method.

   - This method usually requires the use of professional exhaust equipment or tools and following specific operating procedures.

   - It is recommended that the operation be carried out by professional maintenance personnel.

 Third, follow-up checks and adjustments

1. Check hydraulic fluid level:

   - After exhausting is complete, check the level in the hydraulic fluid reservoir again. If the hydraulic fluid is insufficient, replenish it to the specified level in time.

2. Adjust the pedal free travel:

   - Adjust the free travel of the clutch pedal according to the vehicle manufacturer's recommendations. This will help ensure proper clutch operation and improve driving comfort.

3. test clutch function:

   - Start the engine and test the clutch function. Ensure that the clutch engages and disengages smoothly and that the clutch pedal feels smooth and strong when depressed and released.

 IV. Precautions

1. Safety first:

   - Before carrying out any maintenance work, make sure that the vehicle has been parked in a safe location and the engine switched off.

   - Also, wear proper protective equipment such as gloves and goggles.

2. Follow specifications:

   - Follow the specifications and recommendations in the vehicle manufacturer's service manual. Do not alter or omit any steps.

3. professional maintenance:

   - If you are unfamiliar with the hydraulic clutch venting process or are experiencing difficulties, seek the help of a service professional. They have the specialised knowledge and skills to ensure the accuracy and safety of the venting process.

 Additional information

- Check the quality of the hydraulic fluid: If, during the bleeding process, you notice that the hydraulic fluid has become dark in colour or has impurities, it may need to be changed.

- Avoid splashing of hydraulic fluid: Be safe when venting and avoid splashing of hydraulic fluid on the skin or in the eyes.

- Ventilate well: Operate in a well-ventilated environment to avoid inhaling harmful gases.

By following the above steps and precautions, you can successfully remove air from the hydraulic clutch and ensure that the clutch works properly.

Summary:

To remove air from the hydraulic clutch, make sure that there is sufficient hydraulic fluid, prepare the appropriate tools, carry out the air venting operation by means of manual air venting, auxiliary air venting or mechanical air venting, and then check the level of the hydraulic fluid, adjust the free travel of the pedal and test the clutch function. Pay attention to safety, follow the norms during the exhaust process, and seek professional maintenance when you are not familiar with it. At the same time, check the quality of the hydraulic fluid and avoid hydraulic fluid spraying, and ensure that the operation is carried out in a well-ventilated environment.