How Long Does it Take to Flush Brake Fluid?

I know what you're thinking. "Why would I ever need to flush my brake fluid?" And trust me, I get it. Brake fluid flushes sound like a total pain... But did you know that if you don't flush your brake fluid on a regular basis, it can corrode your brake lines and calipers? Yikes! 

So even though it might not be the most exciting task, it's definitely important. How often should you flush your brake fluid? Read on to find out.

How long does it take to flush brake fluid?


On average, it takes about 30 minutes to flush the brake fluid. You'll need a few tools on hand, including a funnel and a clean container to catch the old fluid.

However, the answer depends on what type of brake system you have. If you have a hydraulic braking system, you will need to wait longer than an air-based braking system.

Hydraulic systems are more common because they provide better control over the vehicle. They also require less maintenance. However, they do use oil as their primary component. This means that the brake fluid must be replaced every few years.

Air-based systems are much easier to maintain. They don’t require any oil or other components to work properly. They only contain compressed air. The air pressure pushes against the pads and rotors to slow down the wheels.

If you have a manual transmission, you will need a little longer to flush the brake fluid. Manual transmissions use a clutch to engage gears. When the driver releases the clutch, the engine engages the gearbox. Then when the driver presses the accelerator, the engine disengages, and the gearbox engages.

You won’t need to worry about flushing brake fluid if you have an automatic transmission. Automatic transmissions automatically shift gears based on speed and road conditions.

How often should you flush your brake fluid?


The best way to determine how often you should flush your brake fluid is by checking your owner's manual. Most manuals recommend changing the brake fluid every two years.

But some vehicles may not require brake fluid changes until after five years. For example, if you drive many miles each year, you might want to change the brake fluid sooner.

It’s always recommended to check with your mechanic before making any major repairs. He or she will be able to tell you whether or not you need to replace the brake fluid.

What are the benefits of flushing your brake fluid?

Flushing brake fluid is a good idea for several reasons.

First, it ensures that all the contaminants are removed from the fluid.

Second, it ensures that the brake system works properly.

Third, it reduces the risk of overheating the brake fluid. And lastly, it prevents corrosion from forming inside the brake lines.

Overheating is a big concern. If the brake fluid gets too hot, it could cause damage to the brake system. In addition, it could make the brake feel mushy.

Corrosion is another problem if you don't flush the brake fluid. Corrosion occurs when metal parts come into contact with water. This causes rusting, which damages the brake system.

Over time, brake fluid becomes contaminated. Contaminants like dirt, dust, and even tree sap can build up in the brake fluid. These contaminants reduce the effectiveness of the brake system.

What type of brake fluid should you use?

There are three types of brake fluids: DOT 4, DOT 3, and DOT 2. Each one has its advantages and disadvantages.

DOT stands for “Department of Transportation.” It refers to the federal agency that sets standards for automotive products.

DOT 4 is the most commonly used brake fluid. It meets the highest safety requirements. It’s also easy to find at local auto parts stores. But it does cost more than DOT 3 and DOT 2.

DOT 3 is less expensive than DOT 4. It’s still safe enough to use. However, it doesn’t meet the same high safety standards as DOT 4.

DOT 2 is the least expensive option. It’s usually found at discount stores. But it isn't effective as DOT 3 or DOT 4.

How much does it cost to replace brake fluid?

Replacing brake fluid is relatively inexpensive. The average price is around $100. But prices vary depending on where you buy the brake fluid.

What are the signs that you need to flush your brake fluid?

If you notice any of these signs, then it is time for a change of brake fluid:

- Your car’s brakes feel spongy or soft when applying pressure

- Your car’s brakes squeak or squeal when applying pressure

- You hear a hissing sound when you apply the brakes

- You see smoke or steam coming from under your car’s hood

How Long Does it Take to Flush Brake Fluid? FAQs.

1. How long does it take to flush brake fluid?

It takes about 1/2 hour for the brake fluid to be fully flushed out of the system. However it depends on the expertise level. An expert may do it within 30 minutes and a person having no expertise could take hours to finish the task.

2. What are the causes of brake fluid becoming dirty?

The contamination with dirt and dust particles can be caused by a lack of care in cleaning the brake system. The water content in the brake fluid can be increased due to a leak in the hydraulic system or because condensation has occurred when braking heavily.

3. What are the symptoms of dirty brake fluid?

The symptoms of dirty brake fluid can vary depending on the type of fluid and how dirty it is. The most common symptom is a decrease in stopping power.

If you are experiencing a decrease in your car's stopping power, it might be time to check your brake fluid. Dirty brake fluid can cause several problems, including insufficient stopping power and the pedal feeling spongy or soft.

If you are experiencing any of these symptoms, it is important to have your brakes checked as soon as possible by an automotive professional.

4. Should I flush my brake fluid with a different type of fluid?

Some might think that changing the brake fluid to a different type can improve brake performance. But, in reality, this is not true. This can even cause problems like corrosion and contamination of the system.

5. What is the difference between DOT 3 and DOT 4 brake fluid?

Brake fluid is a hydraulic brake system's lifeblood. It's what keeps the whole system running smoothly. DOT 3 and DOT 4 are two different types of brake fluids that are used for different purposes.

DOT 3 is an old type of brake fluid used on most cars before the 1980s, before it was replaced by DOT 4 due to its poor performance in cold weather. Some people still use it as a cheap alternative to DOT 4. However, it should not be used as a replacement for DOT 4 because it doesn't perform well in colder temperatures. Also, it can cause your brakes to lock up or your car to stop working altogether.

DOT 4 is a newer type of brake fluid that has replaced DOT 3 due to its better performance in cold weather and ability to stop vehicles on icy water.


In conclusion, it is important to regularly check and flush your brake fluid to ensure your and your passengers' safety. Depending on your car type, it is generally recommended to flush your brake fluid every 30,000 miles. Although it may be tempting to do this yourself, it is best to leave it to the professionals. I split this sentence


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.