Air Sound When Pressing Brake Pedal? Causes and Fix

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Last Updated on January 27, 2023 by Victor Lukasso

Many drivers have experienced a strange air sound when pressing the brake pedal, and this can be a cause for concern. The brake system is a crucial component of any vehicle, and if it is not functioning properly, it can affect your ability to stop safely.

A noisy brake system can be a sign of a serious problem, and if it is not addressed, it can lead to reduced braking performance and increased stopping distances, which can be dangerous.

If you hear air noise when pressing the brake pedal, it may be due to a problem with the brake booster or the brake booster hose.

In this article, I’ll show you possible reasons why air sound is produced when the brakes are applied and possible ways to fix the issue.

Causes of Air Sound When Pressing Brake Pedal

Some of the reasons why the brake pedal emits air noise when applied are;

  • A faulty Brake Booster/Brake Booster Hose
  • Bad brake caliper
  • Leaking Brake Master Cylinder
  • Problematic Brake Lines
  • Contaminated Brake Fluids
  • A faulty Brake Booster/Hose

The brake booster or brake booster host consists of the booster diaphragm, vacuum hose, and cylinder gasket and is a device that uses engine vacuum to assist with braking. It is usually connected to the brake pedal using the vacuum hose.

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If there’s a leak or hole in the brake booster or hose and air passes through it into the brake system, it’ll make a noisy sound whenever the brake pedal is depressed.

The booster diaphragm on its own end controls the brake pressure when the brake pedal isn’t engaged.

1. Bad Brake Caliper

Another potential reason why air sound is produced when pressing the brake pedal is because of a problem with the brake calipers or brake pads.

The brake caliper is responsible for holding the brake pads and getting in contact with the rotors when the brake is engaged.

If the calipers aren’t working fine probably due to leaks or corrosion, then air could use that avenue to get into the brake system thereby creating a noisy sound when the brake pedal is applied.

2. Leaking Brake Master Cylinder

A leaking brake master cylinder can introduce air into the brake system and cause the system to produce an air noise when the brake is applied.

3. Problematic Brake Line

If the brake lines are damaged or corroded, it can cause air to be drawn into the brake system, which can create a noisy sound when the brake pedal is pressed

4. Contaminated Brake Fluids

if the brake fluid is contaminated or has absorbed moisture, it can cause air bubbles to form in the brake system, which can also create a noisy sound when the brake pedal is pressed.

How to Fix Air Sound When Pressing Brake Pedal

We can’t deny the fact that the brake system is complex and as such I’ll recommend you take your vehicle to a professional mechanic for proper diagnosis and repair.

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Although, you can try changing the brake fluid or changing the faulty Brake booster hose; that might not be enough at times and would require in-depth analysis.

In order to diagnose and fix the problem, it is important to have a qualified mechanic inspect the brake system. They will be able to determine the cause of the air noise and recommend the appropriate repair. In some cases, it may be necessary to replace the brake booster, the brake booster hose, the brake calipers, or the brake pads.

FAQs

Q: Why does it sound like air coming from the brake pedal?

If it sounds like air is coming from the brake pedal, it is likely due to a problem with the brake booster or the brake booster hose.

Q: Is it safe to drive with hissing brakes?

It is not safe to drive with hissing brakes. Hissing noises from the brakes can indicate a problem with the brake system, and if the problem is not addressed, it can lead to reduced braking performance and increased stopping distances.

This can be dangerous, especially if you are driving at high speeds or in heavy traffic. If you hear hissing noises from the brakes, it is important to have the problem diagnosed and repaired as soon as possible by a qualified mechanic. Do not continue to drive the vehicle until the problem has been addressed.

Q: How do you fix a hissing brake booster?

To fix a hissing brake booster, you will need to first diagnose the cause of the problem. The most common cause of a hissing brake booster is a leak in the brake booster hose, which connects the brake booster to the brake pedal. To diagnose the problem, you will need to inspect the hose and look for any signs of damage or leaks. If the hose is damaged or leaking, it will need to be repaired or replaced.

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If the brake booster hose is not the cause of the problem, it is possible that the brake booster itself is faulty. In this case, the brake booster will need to be removed from the vehicle and inspected for damage or other issues. If the brake booster is damaged, it will need to be repaired or replaced.

Once the cause of the problem has been diagnosed, you can take the appropriate steps to fix the hissing brake booster. If you are not confident in your ability to diagnose and repair the problem, it is best to have a qualified mechanic perform the work to ensure that it is done properly.

Conclusion

If you hear air noise when pressing the brake pedal, it is important to have the problem diagnosed and repaired as soon as possible.

A properly functioning brake system is essential for the safety of you and your passengers, and it is essential for the proper operation of your vehicle.

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