How to use a Vacuum Brake Bleeder?

How to use a Vacuum Brake Bleeder?

The brake fluid of an automobile is an essential part of the brake system. The pressure you apply to the brake pedal moves the brake fluid, which moves the brake parts to slow your automobile. Unfortunately, the brake fluid can get contaminated with dust, rust, and moisture, which impedes the brake properly and stops your vehicle.

Several experts recommend bleeding the brake system of your vehicle to maintain the brakes. One of the most effective ways to bleed your automobile’s brake system is with a vacuum pump. Bleeding your automobile brake system with a vacuum helps you eliminate any trapped air and other objects from the brake lines. Find out more about bleeding your brake system with a vacuum pump below.

When should you use a Vacuum Pump to Bleed your Brake System?

Under regular operation, you do not need to bleed your automobile brake system. However, some situations will require you to bleed. Below is some situation when you should bleed your brake system:

●       Brake Pads are Completely Worn

In a situation where the brake pads are completely worn out, it could cause the fluid level in the master cylinder to drop. And if it drops too far, then air can get into the brake system. When this happens, you need to bleed the brake system to eliminate all the air bubbles in the system for optimal functioning.

●       Replacing the Disc Brake Caliper

If you want to replace the disc brake caliper of your brake system, it will require you to disconnect the brake lines; this can also cause air bubbles to get into the brake lines. When you want to replace the disc brake caliper, ensure you are ready to bleed the brake system with a vacuum pump to eliminate any air bubbles entering the brake system.

●       Replacing other Brake System Components

Subsequently, if you want to replace any other brake system component, it will require you to disconnect the hydraulic part within the brake system. And if you do disconnect it, it will cause air to get into the brake lines. So again, the master cylinder is a good example.

●       Compressed Caliper Piston

Another scenario where you need to use a vacuum brake bleeder is when you open the bleeder valve to compress the piston while changing the brake pads. When you open the bleeder valve, air will enter the brake lines, and when it does, you need to use a vacuum brake bleeder to get rid of the air.

How to Bleed Brakes with a Vacuum Pump?

To bleed brakes with a vacuum pump, you will need a car jack, a jack stands, rags or towels, a bleeder wrench, your vehicle’s specific brake fluid, an air compressor greater than 2 CFM, and a vacuum brake bleeder. With these items at hand, let’s begin:

Step 1: Get Access to Bleeder Screws

Begin by raising your vehicle with a floor jack. After that, remove the tires to access the bleeder screws located on the vehicle’s brake calipers.

Step 2: Set up the Brake Bleeder

Next, hook up your assembled vacuum brake bleeder to an air compressor that is not less than 2 CFM.

Step 3: Extract old Fluids from the Master Cylinder

Remove the master cylinder reservoir cap and insert the brake bleeder nozzle into the reservoir. Turn on the air compressor and depress the airflow handle to extract the old fluid from the master cylinder. Once the old fluid has been extracted, remove the bleeder nozzle from the reservoir.

Step 4: Top off Brake Fluid

Top off the master cylinder to the maximum with fresh brake fluid as recommended by your vehicle manufacturer.

Step 5: Slide the correct Sized Box Wrench on the Bleeder Screw

Ensure you make use of the correct brake bleeding sequence. Typically it should start at the brake furthest from the master cylinder reservoir, then the passenger side rear brake.

Step 6: Prepare the Vacuum Bleeder.

Turn on the air compressor, apply suction by depressing the airflow handle, then move the airflow handle securing clamp over the handle for continuous suction.

Step 7: Loosen the Bleeder Screw to Bleed the Brakes

Loosen the bleeder screw on the vehicle to about half turn till the brake fluid draws out. Ensure the master cylinder reservoir does not run empty as this will cause air to enter into the brakes system, which will not make the brake system operate properly.

Step 8: Bleed Brakes till Fluid Runs clear

Bleed the brakes till there were no visible bubbles in the bleeder hose. Then close the bleeder screw to stop extraction and remove the rubber bleeder nipple from the bleeder screw.

Step 9: Repeat steps 4 to 7

From the passenger side rear, move to the driver side rear, passenger side front, and finish with the driver side front brake. Follow this sequence unless otherwise specified by your vehicle’s service manual.

Step 10: Check the Master Cylinder Reservoir Fluid level

Check the master cylinder, ensure it is filled to the maximum level, and replace the master cylinder cap.

Step 11: Inspect your Work.

Run the engine and depress the brake pedal to ensure they are firm. If the braking feels spongy, that means air may be in the system; this means you have to carry out the bleeding process again.

Bottom Line

To sum things up, if you ever find yourself in a situation where you have to bleed your vehicle brake, you should consider using a vacuum brake bleeder. It not only makes the process easier, but it is more efficient. Using a vacuum brake bleeder is the best solution to get rid of air bubbles in your vehicle’s brake system. Additionally, brake bleeding not only gets the air out of the brake system but can also help refresh the system with new brake fluid.

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