How to Bleed a Clutch with a Vacuum Pump?

The clutch master cylinder contains a dam with brake fluid. It is connected to the clutch-dependent cylinder through pipes. When you nudge the hold pedal, the brake liquid flow moves from the clutch master cylinder to the dependent cylinder, applying the required pressure to move (hold) the clutch, and this shift gears on your manual transmission.

The hydraulic grip system provides greater comfort and relief while pressing the clutch pedal to change gears rather than counteracting the activated cable system. Vastly hydraulic clutch procedures have dedicated master cylinders; however, some cars use a single master cylinder on both the brake and clutch systems.

Use the following steps to locate the dependent cylinder and open the bleeder valve. Here’s how to bleed a clutch dependent  cylinder:

Collect Suitable Items

Brake bleeder scanner or line wrench – 8mm or 10mm for the most common sizes, Brake fluid – DOT (Department of Transportation) 3 or higher (see owner’s manual for the correct liquid type), Wipe aquarium tubing – one to two feet, Drainage pan, Empty water bottle, Jack floor, Friend/helper (hand-copying), Gloves, Vacuum bleeder by hand (Optional), Fabrics or paper towels for cleaning, Safety glasses, Jack stand safety x 2, suction tool or large turkey baster

Find the Brake Master Cylinder

Open the hood and find the brake master cylinder on the driver’s side, next to the fire extinguisher.

Tip: When doing routine care, first open the lid on the master cylinder pool and then use the turkey baster to absorb the old brake fluid before applying the first one and replacing the new fluid.

1. Fill the Clutch Master Cylinder – Check your owner’s manual to find the brake liquid specific to your car. Then, pour the liquid into the clutch master cylinder.
2. Get a Dependent Cylinder – In most cars, it will be tied outside the transmission. The dependent cylinder is inside the transmission, but you can easily access the bleeding valve externally. The timeliest way to locate over a dependent cylinder is to follow the pressure line from the clutch master cylinder.
3. Verify the location of the Bleeding Valve or Blood Nipple. In some cases, it may be necessary to use a floor jack and safety stands to remove the floor and protect it so that you can access the dependent cylinder.

– Use gravity to bleed the dependent cylinder.

5. Open the Bleeder Valve – Use the line screw to open the bleeder valve in the dependent cylinder. Next, insert a drain pan under the dependent cylinder to hold the brake liquid.
6. Bleed the Brake Fluid – Leave the bleeder open and allow gravity to bleed the dependent cylinder for one to three minutes.

Warning

When solemnity is bleeding, monitor the level of brake fluid in the master cylinder. It is essential to prevent the brake fluid from getting too low because it will cause the air to absorb and return to the system.

Tip: You can use your line screw and touch the dependent cylinder to move some air packets that may be stuck inside.

7. Attach the Tubing to the Bleeder Nipple – Close the bleeder valve in the dependent cylinder and attach a piece of aquarium tubing to the bleeder nipple. Place one end on an empty water bottle and lift the main cylinder with brake fluid.
8. Pump Evacuated Grip – If you have a colleague with you, let them get into the driver’s seat and pump the clutch pedal 10 to 15 times to create pressure. Then press and hold the lump hold down ultimately.
9. Check the Bleeder – While the holding pad is held down, use your line screw and turn on the bleeder. Look at the air bubbles and break the fluid coming out of the dependent cylinder. When the flow of brake fluid stops, turn off the bleeder, and your assistant removes the holding base.
10. Repeat Steps as needed – Repeat steps 4 and 5 until only the fluid brake comes out of the bleeder in the dependent cylinder.

Warning

• Never let go of the clutch pedal with an open bleeder valve. Accomplishing so will stink air into the system.

Tip: When you commence seeping the clutch, it is common for the clutch pedal to sit down even when removed. Please don’t panic, but use your foot or reach down, throw it back, and continue the bleeding process. As more air is released and pressure is created, the clutch pedal will appear on its own.

Warning

• When percolating from a conditional cylinder, never allow the fluid level in the clutch master cylinder to be too low, or you will absorb air in the hydraulic system, and the method will require to be restarted.

Use a Hand-Held Breathing Pump to Bleed the Clutch

1. Open the bleeder valve – Use the line screw to open the bleeder valve in the dependent cylinder.
2. Attach a Vacuum Pump – If you do not have a partner or prefer to use a hand-held vacuum pump, attach a vacuum pump to the dependent cylinder.

Tip: Check the vacuum pump manual to find out how to set up and operate your specific pump.

3. Remove Air Bubbles from the Dependent Cylinder – Open the bleeder lid and use a suction pump to absorb air bubbles from the dependent cylinder. Again, remember to check the fluid level while doing this.
4. Close the Bleeder Valve – If you see a constant flow of fluid brakes without air bubbles, you can close the bleeder valve.
5. Review the Clutch – After the pendant cylinder bleeds, start the car and check the clutch for proper operation.

Bottom Line

Whenever you open a compression program, you will need to bleed to remove packets from the air. Air pockets prevent the hydraulic system from working correctly. In addition, you may need to bleed the dependent cylinder as part of standard repair procedures, such as inserting another vehicle fluid or because you need to replace the dependent cylinder. For the rest of this article, we will assume that the hydraulic clutch system has its dedicated master cylinder.