Brake Pedal Sounds Like Air Pump

AIR BRAKE PEDAL W/ BENDIX T236979D VALVE Daves Industrial Surplus LLC
AIR BRAKE PEDAL W/ BENDIX T236979D VALVE Daves Industrial Surplus LLC from

Brake Pedal Sounds Like Air Pump


If you’ve noticed that your brake pedal sounds like an air pump when you press it, it’s important not to ignore this issue. The brakes are a critical component of your vehicle, and any unusual noises should be investigated and resolved promptly. In this article, we will explore the possible causes of a brake pedal sounding like an air pump and provide you with some tips on what you can do to fix the problem.

Possible Causes

1. Air in the Brake System

The most common reason for a brake pedal to sound like an air pump is the presence of air in the brake system. Air can enter the system through a leak or during a brake fluid replacement if not properly bled. When you press the brake pedal, the air compresses, creating the sound you hear.

2. Worn Brake Pads

Another possible cause of the air pump sound is worn brake pads. As the brake pads wear down, they can create a squealing or hissing noise when the brake pedal is pressed. This noise can be mistaken for the sound of air being released.

3. Faulty Brake Calipers

A faulty brake caliper can also result in a pedal sound resembling an air pump. If the caliper is not properly releasing, it can cause the brake pads to drag against the rotor, creating a hissing or whooshing noise.

4. Brake Fluid Contamination

Contaminated brake fluid can cause the brake pedal to sound like an air pump. If the fluid becomes contaminated with air, water, or debris, it can create air pockets or cause the brake components to malfunction, resulting in unusual sounds.

What You Can Do

1. Check Brake Fluid Level

Start by checking the brake fluid level in the reservoir. If it is low, you may have a leak in the system that needs to be repaired. If the fluid appears dirty or contaminated, it’s recommended to have a professional flush and replace the brake fluid.

2. Inspect Brake Pads

Inspect the brake pads for wear. If they are worn down beyond the recommended thickness, they should be replaced. Worn pads can cause noise and compromise braking performance.

3. Check for Leaks

Inspect the brake lines, calipers, and fittings for any signs of leaks. If you notice fluid leaking, it’s crucial to have the issue addressed immediately by a qualified mechanic.

4. Bleed the Brakes

If you suspect air in the brake system, bleeding the brakes may help resolve the issue. This process involves removing any air bubbles from the brake lines, ensuring proper brake function and eliminating the air pump sound.

5. Seek Professional Help

If you are unsure about diagnosing or fixing the issue yourself, it’s best to consult a professional mechanic. They have the expertise and tools to accurately identify and repair any problems with your brake system.


A brake pedal that sounds like an air pump is not something to ignore. It could indicate a problem with your brake system that requires attention. By understanding the possible causes and following the recommended steps, you can address the issue promptly and ensure your vehicle’s braking performance is restored to its optimal state.