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When we press the clutch pedal,
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the brake fluid in the clutch master cylinder reservoir begins to flow into the clutch slave cylinder. This creates the hydraulic pressure needed to activate the clutch and uncouple the engine shafts and wheels.
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If we notice that the clutch slips or does not engage completely, we must bleed the clutch master cylinder to fix this problem. This means you are letting air escape from the cylinder. In the previous article, we explained how to tell if the clutch master cylinder is damaged.
To properly bleed the clutch master cylinder, we will need someone else to reduce the pressure on the clutch at the proper time. In addition, more available hydraulic fluid will be needed.
The steps for bleeding the clutch master cylinder are listed below:
1) Locate the Clutch Master Cylinder - We must first locate the vehicle's clutch slave cylinder, which is at the bottom right of the master cylinder, and identify the bleed valve.
2) Open the bleed valve and bleed the air: our partner should apply firm pressure to the clutch pedal in the vehicle's cab and press the clutch pedal all the way down. Then, we use a wrench (usually 8 mm) on the bleed valve to loosen it. We loosen the valve until the air comes out until the hydraulic fluid "bleeds". We must be sure to place a container down so that the fluid falls into it.
3) Close the bleed valve: use the key on the bleed valve to tighten it again. The partner slowly removes pressure from the clutch pedal until it reaches its normal position. We check to see if there is still enough fluid in the master cylinder, and if there is not, then there may be a leak somewhere, such as the clutch hose or one of the cylinders. Even if the leak is the size of a pinhole, we must replace that part completely.
4) Bleeding the slave cylinder from the clutch: we repeat the process again by removing air from the slave cylinder. Our partner applies firm pressure on the clutch pedal so that it touches the floor and we use the key to loosen the valve until the air is purged. We keep repeating this air purging cycle until no more air comes out, but only liquid in its place. At that point, close/tighten the bleed valve.
5) Top Fill Brake Fluid Reservoir: The partner slowly releases the clutch pedal until it returns to its normal position and goes to the master cylinder to open the top of the brake fluid reservoir. We take additional hydraulic fluid and pour it into the reservoir until the fluid reaches the full line. It is important not to overfill.
6) Test the clutch pedal: we start the vehicle and test the clutch by pressing the pedal. You will feel a firm feeling in the clutch and you can change gears smoothly. If they are smooth, you are ready.
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