When Do You Have To Bleed Brakes After Changing Pads?

When do you have to bleed brakes after changing pads? This is a problem that many people face when servicing their brakes because they wonder when is the right time to brake.

Do you find yourself stuck in the same problem? If so, stay tuned, as this post will have you solve this with ease.

And also, we will provide you with much useful information related to what you are looking for!

Do You Have To Bleed Brakes When Changing Pads?

do you have to bleed brakes after changing pads

Do I need to bleed brakes after changing pads?

YES. Bleeding helps eliminate trapped air from the brake lines. The air bubbles will decrease the system’s pressure, making the brakes spongy and taking longer to stop, and the vehicle may not stop if left unattended.

You must be capable of stopping quickly, regardless of how fast you travel. The brakes on a car are hydraulic, which means they work by pressing a hydraulic  brake pressure.

Regarding important components, your brakes are at the top of the list. So, keep a sharp eye on it.

When Do You Have To Bleed Brakes After Changing Pads?

When should you bleed brakes after changing pads? The brake system is not necessary to be bled in regular operation. However, there are certain circumstances in which bleeding is required:

Completely Worn Brake Pads

Your car’s brakes are a complex system of machine components, and when one fails, wear can spread to other systems.

For example, if your brake pads wear out over a particular point, you risk harming the braking rotors. When you stomp on the brake, the brake pads crush the rotor, bringing your car to a stop.

When the pads are extremely worn, the interface metal on the pads will grind against the rotor every time you brake, causing a popping sound when braking and potentially rotor breakage.

As a result, having the brake pads replacement process and inspecting your brake system will help you make the most of its parts and prevent expensive and avoidable brake breakdowns.

Disc Brake Caliper Or Drum Brake Cylinder Replacement

It necessitates the brake cables’ disconnection. When this occurs, air enters the brake lines.

While you may have disc or drum brakes on your vehicle when parking or going slow, there are numerous other brakes to consider!

To double-check, look through one of the tops of your front wheel holes. If you see a smooth metal surface, that’s your disc rotor.

However, when you find the round surface is rusty and not smooth, it is your brake drum. Some propellers will have little rust spots.

Another method is to examine the back of the wheel; disc brakes have a rubber line leading to the brake calipers, but drum brakes have a metal brake hose.

Replacement Of Some Other Brake System Components

When a hydraulic device in the braking system fails, air enters the brake lines. A case of brake pad replacement is the master cylinder.

Every automobile has one of these cylinders. It is placed at the bottom of the brake pedal and is responsible for distributing fluid and pressure to all auxiliary cylinders.

They are positioned on each wheel and are in charge of braking. As the name implies, a master cylinder typically includes a brake fluid reservoir.

The brake system of our vehicle is critical, as a faulty brake system can occasionally cause an accident when driving.

Compressed Caliper Piston

You may need to release the exhaust valve to compress the piston while changing brake pads, as it could enable air into the brake line.

A brake caliper works in conjunction with the brake rotors. It does not move, but it comprises the moving brake pads. You can easily spot this part on most automobiles.

It is reasonably large or very large, and the rotor’s size determines the caliper’s size. Larger calipers (as well as brake pads) are needed in larger rotors.

One important thing to know is that you can effortlessly remove or repaint brake calipers when necessary. These parts also come with pistons, which push the brake pads using oil.

The more pistons, the more pressure and the greater-stopping power!

If your piston doesn’t compress, check the reasons why here.

How To Bleed Brakes?

How To Bleed Brakes

Here are four ways how to bleed brakes after changing pads:


Place a container beneath the drain screw, then open the screw and allow gravity to suck the old liquid into the container.

Be prepared to tidy up afterward. That fluid will stream down the portions between the drain screw and the container rather than in a straight path.


Place a reservoir beneath the drain screw and slowly squeeze and release the brake pedal, allowing the liquid and air to escape. Work the brakes smoothly to prevent generating many air bubbles, which can contaminate the new fluid.

Make sure the liquid does not produce foam, as this indicates the formation of additional air bubbles.


Place another container under the hemodialysis machine screw and release it.

Then, at the master cylinder, employ a pressurized brake fluid reservoir to force fluid and air through the mechanism and away from the reservoir.


After opening the vacuum screw, attach the vacuum cleaner to it. It sucks liquids and air out and back into a container.

Frequently Asked Questions

Do You Have To Bleed Four Brakes?

Yes, for the most part.

Because of the dynamics of technology in the automobile sector, most vehicles feature unique braking systems. To avoid further damage, final attention is required in the event of a bleeding brake.

After opening a brake line, the best method is to bleed all four brakes. However, if the brake lines are separate, it is unnecessary to bleed all four brakes.

As a general guideline, locate your vehicle’s brake lines and use the right brake bleed process to repair them. Make certain that no unsuitable braking fluid is mixed into the vehicle.

What Happens When You Do Not Bleed Your Brakes?

Do you have to bleed brakes when changing pads? Yes, you should. But what will happen if you don’t?

When air bubbles form between the brake lines, the whole system fails. The capability to stop the car is ineffective and can result in road carnage.

The ride will be gentler, and stopping ranges will be greater. It is strongly advised to bleed the brake pads with air bubbles.

It is well known that air bubbles lower hydraulic pressure and impair damper braking efficacy. Remember to use caution when bleeding the brakes.

Why Are My Brakes Still Spongy After Bleeding?

Spongy brakes are unpleasant, particularly after bleeding. Reaching the root of the problem is the best option when dealing with a spongy sensation.

Unclean brake fluid, mechanical leakage, and inappropriate bleeding are all possible causes of bleeding.

The fundamental reason for the spongy sensation after the brake bleeds could be air bubbles between the brake lines. The best remedy is to remove the bleeder nipple and reposition the caliper piston.

It aids in appropriately positioning the brake pads and permits the environment to improve the system.

Can I Bleed Brakes With Tires On?

Yes. But if this is the first time utilizing the brakes, we recommend consulting with a certified specialist.

By removing the tires, you will also have quick access to the bleeding granules. For newbies, this procedure is laborious and time-consuming.

It may take you a while to bleed the braking system. The benefit of detaching the tires is that they are not contaminated by brake fluid.

Furthermore, it lowers the possibility of brake fluid spilling on the garage floor.

Do I Need To Bleed The Brake After Changing The Caliper?

Not at all. However, if your vehicle boasts 3 ABS systems, you can bleed each brake independently when changing any front calipers.

The Bottom Line

In short, do you have to bleed brakes after changing pads? If yes, when? We hope you have found the answer to this question with the provided information above.

You must do this upkeep unless you want a spongy and less responsive brake that leads to unwanted incidents.

Thank you for following the article. If you have any concerns, please let us know in the comment below!

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