Do I Need To Bleed Brakes After Changing Pads

Brakes are a vital component of any vehicle, and ensuring their proper function is essential for safe driving. When replacing brake pads, it’s important to take the necessary steps to ensure the brakes are working correctly. Bleeding the brakes is common, but not everyone is sure if it’s necessary after a pad change.

You will need to bleed your car’s brakes after changing its pads. This step aims to ensure that the braking system is cleaned of any dirt and debris. When changing brake pads, it is common for people to open both the bleeder valve and squeeze the calipers. Let’s dig into learning more about this fact.

When Do I Need Bleed Brakes?

Bleeding brakes are an important part of vehicle maintenance to ensure your brakes work properly and safely. It involves removing air from the brake system and filling it with fresh, clean fluid. This process should be done whenever you notice changes in your car’s braking performance, such as a spongy or soft feeling when you press the brake pedal, longer stopping distances, or signs of leaking. By bleeding your brakes regularly, you can identify problems early and ensure no air bubbles exist within the brake system.

Although bleeding your brakes doesn’t have to be done frequently, it is highly recommended to get it done before long trips or if there has been a significant change in driving behavior.

Doing so will allow you to maintain maximum control over the car and shorten the braking distance in the case of an emergency. While some DIY kits are available for this task, if you’re unsure how to do it properly and safely, it’s better to get help from a professional mechanic who can do it without damaging other parts of your vehicle’s brake system.

Why I Need Bleed Brakes?

Bleeding brakes are essential to vehicle maintenance, as it helps ensure your car’s braking system remains in good working order. When you apply the brake pedal, you may notice a ‘spongy’ or ‘soft’ feeling instead of the normal firm action.

This can be caused by air being trapped in the system, where bleeding the brakes comes into play. The process involves pushing out air bubbles and replacing old brake fluid with fresh fluid so your car has maximum braking power.

The bleeding brakes often involve using a special tool or vacuum pump to help get rid of the trapped air from each wheel cylinder. Using a quality brake fluid is important, as certain fluids are designed for specific brakes, such as drums or disc ones on vehicles.

A useful tip is never to work on your brakes without consulting a professional mechanic who knows exactly how the procedure should be carried out safely and correctly. In addition, regular servicing of your vehicle’s braking system is also extremely important. These check-ups should include checking and cleaning your brakes to ensure optimal functioning.

What’s the Right Way to Bleed?

Bleeding your brakes can be intimidating, but with the right tools and a bit of help, it doesn’t have to be. The most common way to bleed brakes is using a 1-liter water bottle.

Make a small hole at the top of the lid to create the necessary tool. This is where a silicone pipe will be pushed through to help in the bleeding process. You may also want to invest in a caliper bleeder nipple which isn’t necessary but can make the job easier.

Before beginning the brake bleeding process, you must enlist some help. Have anyone assisting you remain inside and prepared to press down on the brake pedal as needed.

Additionally, ensure you slightly raise your car using a jack to have better access to each brake for easier bleeding. With these simple steps before beginning, brake bleeding can become much less daunting than initially feared – leaving only quick and easy maintenance ahead.

Why Does Air Get into While Bleeding?

Air can get into the brake fluid for several reasons. The main reason is that the brake fluid tends to absorb moisture when exposed to the air. This can happen when you open either the brake line or the brake fluid reservoir, as these situations expose the brake fluid to air.

For example, many mechanics recommend opening up the brake fluid reservoir while changing brake pads, as it helps release pressure on them and makes them easier to remove. Additionally, once a person opens up their brake line, air can travel through that line and make its way into the master cylinder, which will mix with the existing brake fluid.

The result of this process is that it exposes your brakes to moisture and creates air bubbles in your brake fluid, which causes a decrease in the performance and reliability of your brakes. It can also lead to heat build-up in your brakes, leading to further damage if not dealt with properly.

Therefore, it’s important to regularly check your car’s brakes and ensure they are properly sealed before taking a drive if any part of the braking system has been disturbed recently to avoid putting yourself at risk while driving.

What Can the Bubbles Do?

Air bubbles in the brake fluid reservoir can cause serious safety problems while driving. It is important to check the brake fluid level and the appearance of air bubbles regularly to ensure a safe braking system.

In hot climates and during hard braking, there is an increased risk of air bubbles forming in the brake fluid due to vaporization. The vaporized air increases the volume resulting in a long distance to stop the vehicle. Moreover, when you press on the brake pedal, it may feel spongy rather than having a firm response due to the lack of a steady flow of hydraulic pressure caused by air bubbles in your brake fluid reservoir.

Furthermore, any moisture present from these air bubbles can result in corrosion or other damage to the internal components of your braking system over time. It is always recommended that you follow your vehicle manufacturer’s instructions for care and maintenance and perform timely fluid flushes and changes as per their recommended schedules.

How Can I Remove Those Bubbles?

If you have changed the brake pads on your vehicle and there are bubbles present in the brake fluid, it is important to take steps to remove them. This is because if left unchecked, these bubbles can cause a decrease in your braking performance and could even lead to failure of the system.

You will need to bleed the brakes to remove the bubbles from your brake system. This involves opening the bleed valves on each brake caliper, one at a time, and pushing the brake pedal until all bubbles have been expelled.

To ensure that all of the air is out of the system, it is important to repeat this process for each brake several times. Additionally, if your vehicle has an ABS (Anti-lock Braking System), you will need to follow the specific instructions for bleeding the brakes on those systems as they are different from standard brakes.

How Long Will It Take to Bleed?

Bleeding your car’s brakes is an important and necessary part of regular vehicle maintenance. It will ensure the brakes run smoothly and properly, ensuring you and your passengers are safe behind the wheel. On average, it should take between 30 to 40 minutes to bleed your brakes, with an approximate 10-15 minute window per wheel.

Brake bleeding should certainly not be done on your own; ideally, there should be two people to execute this task correctly. The person sitting in the driver’s seat has a very big role to play as they need to press the brake pedal for each wheel as it is being bled.

Frequently Asked Questions [FAQs]

1. Can I Bleed Brakes By Myself?

Yes, you can bleed brakes by yourself. Bleeding brakes is a relatively simple process that most people can do with the right tools and some patience. You will need a wrench or socket set, a brake bleeder kit, brake fluid, and an old rag.

2. What Is The Fastest Way To Bleed Brakes?

The fastest way to bleed brakes is to use a pressure bleeding system. This type of system requires the use of a specialized vacuum pump, which connects to the brake lines and creates a vacuum for the brake fluid to flow through. The process is relatively simple, as you only need to connect the pump, open all bleed screws, and slowly pressurize the master cylinder until all air bubbles have been removed.

3. Do I Need To Bleed The Brakes After Changing Pads?

No, you don’t necessarily need to bleed your brakes after changing the brake pads. However, it is recommended that you do. Bleeding your brakes will ensure that all air and moisture have been removed from your brake fluid, which will help keep your braking system running smoothly and safely.

4. Will Air In Brake Lines Go Away?

Air in brake lines is a common problem when changing brake pads, as air can be introduced into the system during the process. To ensure proper braking performance, it is recommended to bleed your brakes after changing pads. This process involves releasing air from the brake lines and replacing the fluid with fresh, clean fluid. The procedure will vary depending on the type of vehicle but typically involves connecting a vacuum pump or special tool to the brake lines and slowly pressing on the brake pedal.

5. Can You Bleed All 4 Brakes At Once?

Many car experts will advise you to bleed all four brakes once the brake line is opened to replace a caliper or do other maintenance work. Nevertheless, it is important to note that this is not a hard-and-fast rule, especially if the brake line you are having serviced is independent of the others.


While it is not necessary to bleed brakes after changing pads, it is recommended to do so to ensure proper performance and safety. Bleeding your brakes should take no more than 40 minutes and can be done with two people. Additionally, if you are performing other maintenance work on your car’s brake line, it may be wise to bleed all four brakes simultaneously.

John D. Archer

John D. Archer is a mechanical engineer and writer based on the area of automotive accessories at, A resident expert and professional, John is passionate about all things automotive and loves to share his knowledge. He has good experience in all kind of automotive accessories. He has worked as a chief mechanical engineer in some reputed automotive garage firm.