Do You Have to Bleed Brakes After Changing Pads: Guide to Do

Do You Have to Bleed Brakes After Changing Pads

Introduction to the topic

Your braking system is one of the most important parts of your vehicle. It’s crucial to have instantaneous stopping power regardless of speed. The hydraulics of a vehicle’s braking system force fluid under pressure to stop the vehicle. Less pressure means spongier brakes and longer stopping distances due to the air bubble. This is merely the first step, though. The vehicle may not be able to stop if left unattended.

There is a solution, but there is also a means to stop this from happening again. Here we will discuss when and how to bleed brakes.

In what way can bleeding brakes help?

Do you feel sponginess when you press the brake? Does it take more time for your vehicle to stop than usual? Your brakes likely need bleeding.

Bleeding the brakes is done to remove any air bubbles from the system. Corrosion of your brake parts might result from air being trapped in the system.

It’s inevitable that your vehicle’s braking fluid will degrade and become polluted as time goes on. The boiling point will consequently decrease.

So, what does this entail for you? Put simply, the braking performance of your vehicle will suffer. A collision can be avoided in some circumstances this way.

The brake fluid’s purpose is to maintain the system’s lubrication. Your brakes will wear out along with the rest of the car if you let it deteriorate too much.

For optimal performance, your vehicle’s safety systems require fresh fluid. Your vehicle will be able to come to a straight stop in an emergency thanks to the anti-lock braking system (ABS) and traction control. Fixing such modules can cost several hundred dollars.

Avoiding the hassle and expense of replacing costly car parts by keeping up with routine maintenance is a good practise for any car owner.

When should you bleed your brakes?

First, you’re not actually bleeding brakes; rather, you’re bleeding fluid and air out of the braking system to eliminate any air bubbles that may have formed prior to refilling the system with new brake fluid.

When you need to bleed your brakes is when:

  • When you notice a sponginess in your brakes.
  • When stopping takes longer and you feel less confident.

A leak, if you will. Fluid loss isn’t the only concern if there are leaks; air could also be escaping. You must bleed the brakes after correcting the leak to eliminate any air bubbles.

The master cylinder may become contaminated with air if you replace worn brake pads. Worn brake pads require more braking fluid when applying the brakes, which empties the reservoir and allows air to enter.

Whenever you replace your brake rotors or pads. For reasons of safety, a brake bleed is an essential part of any brake repair.

At least once a year as a matter of regular upkeep.

When replacing brake pads, do auto mechanics bleed the brakes?

After new brake pads have been installed, the mechanic is not required to bleed the brakes. The pads can sometimes be swapped out without draining the brake fluid or disconnecting the brake lines.

It may be sufficient to just retract the pads or calliper piston while replacing the brake pads, causing the fluid to be pumped back towards the master cylinder. It will make replacing the brake pads easier on you or your professional.

When the brake pads are changed, there is a possibility that the brakes will need to be bled. In most cases, the brake fluid or brake lines are to blame. There may be a need to bleed the brakes after they have been opened or after the brake fluid reservoir has been exposed to air for an extended period of time.

The pressure applied to the brake pedal is transmitted by the braking fluid to the brake pads, which in turn clamp down on the rotor. The braking fluid in the reservoir exerts pressure on the brake lines, which in turn applies the brakes.

It’s important to keep in mind that any brake fluid, including DOT 5, can quickly absorb moisture if you’re not using DOT 5 brake fluid. When the reservoir for the brake fluid is opened, airborne moisture might contaminate the fluid. Some situations may call for a mechanic to release pressure on the brake pads by opening the brake fluid reservoir. Air can also enter the system through the brake line, potentially exposing the brake fluid to moisture and expanding the system’s volume.

Because water has a lower boiling point than brake fluid, it dilutes the latter and reduces its effectiveness. The brake system’s ability to apply pressure to the brake pads can be compromised by the presence of gas bubbles in the brake fluid caused by the presence of excess moisture in the brake fluid. This may be the cause of the mushy feeling you get when you apply the brakes. That’s why it’s crucial to keep the brake fluid reservoir and line away from air and moisture.

Backtracking a bit, when replacing brake pads necessitates accessing the brake fluid reservoir or exposing the brake lines, bleed the brakes afterwards to remove any air from the system and any old brake fluid.

How to bleed new brake pads?

Here’s what you need to know if you want to bleed your brakes by yourself:

1. In order to bleed the brakes, you must locate the bleed valve.

There must be a bleed valve or nipple on every brake calliper. This is typically located at the caliper’s base. If you wish to know where the bleed nipple is on your machine, however, the handbook should be consulted.

2. To release pressure, turn the valve open.

However, the nipple or valve may be difficult to use. Finding the right tool to unlock it may be necessary. In some cases, you may only need a flathead screwdriver. The next step is to drain the brake fluid, so be sure to have a catch pan handy. There’s also the matter of getting the brake fluid ready to be swapped out with the old.

3. Purge the brake fluid

To bleed the brakes, first remove the master cylinder cap and then loosen the bleed valve. The bleed valve’s location then facilitates the natural draining of the used brake fluid due to gravity. It is also possible to employ a pressurised brake fluid container to release the fluid from its container. But since pressing the brake pedal causes pressure to be applied to the brake lines, this fluid can be easily expelled.

4. Refill

After removing the old brake fluid, new fluid must be added to the system. It’s imperative that you fill the master cylinder or brake fluid reservoir to the brim before proceeding. Once you see brake fluid leaking from the bleed nipple, squeeze the brake pedal several times to force out every last bit of the old brake fluid. Once you’ve done so, check the fluid level to make sure it’s at its highest before you seal the bleed valve.

What happens if the brake system isn’t bled?

Air bubbles between the brake lines render the system useless. It’s pointless to try to stop a moving vehicle, and doing so could cause mayhem on the road.

As a result, the driver will notice a spongy sensation and greater stopping distances. It is extremely recommended to use air bubbles to bleed the braking system. Low hydraulic pressure and decreased braking performance are two common effects of air bubbles. Never forget to take safety measures when bleeding the brakes.

Watch Do I need to bleed my brakes after changing pads and rotors | Video

People also ask questions and answers related to Do you have to bleed brakes after changing pads

What happens if you don’t bleed the brakes after replacing the pads?

If you don’t bleed the brakes once air has gotten into the lines, what will happen? There will be no stopping power. You’ll have problems with spongy brakes.

After installing new brake pads, what should you do?

Look for a street or parking lot that is somewhat deserted. …
At 40 miles per hour, apply emergency brakes. …
Take it up to 50 mph and slam on the brakes until the anti-lock braking system kicks in. …
It would be best to do the same thing four more times (step #3). …
Get up to 65 miles per hour, then drop to 15 miles per hour. …
Wait 20 minutes before attempting to brake again. …
Maintaining your brakes properly can increase their useful life.

After replacing the brake pads, how many times should the brakes be pumped?

Brake pads should be seated by pumping the brakes 15–20 times with the car in neutral or park. Increase the fluid level in the braking system or, if necessary, follow the instructions in the bleeding the brakes section to remove the old fluid and install the new.

When do my brakes require bleeding, and how do I tell?

The Proper Time to Bleed Brakes
When you notice a sponginess in your brakes.
When stopping takes longer and you feel less confident.
A leak, if you will. …
When replacing old brake pads, air may be released into the master cylinder. …
Whenever you replace your brake rotors or pads. …
At least once a year as a matter of regular upkeep.

Can you simply just change the brake pad?

Brake pads can be changed in pairs (front and back) or individually. You can have your mechanic fix or replace your front brake pads without your presence. Additionally, remember that your front and rear brake pads wear out at drastically different rates.


After replacing the brake pads, the ideal procedure is to bleed all four brakes. When the brake lines are opened, air might get inside and potentially cause problems. After changing the brake pads, it is recommended to bleed the brakes to get rid of any remaining air bubbles in the fluid.

In this way, brakes can maintain their usual pressure and function properly. Always consult qualified technicians for help. Bleeding the brakes on your own at home is a time-consuming and inconvenient process.

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