Why Is My Brake Pedal Low?
Published: Jun 14 2021 • Updated Sep 29 2025
Why Does My Brake Pedal Sink to the Floor?
If you’ve noticed your brake pedal sinking to the floor, it’s crucial to take action right away. This issue can be a sign of a serious problem with your braking system. In this post, we’ll explore the common causes behind a sinking brake pedal, such as fluid leaks, air in the brake lines, or worn-out components.
A brake pedal that sinks to the floor is a serious issue that demands immediate attention. If you're experiencing this, your safety is at risk. In this post, we’ll walk you through the common causes of this critical problem and provide guidance on when to seek professional brake repair to avoid a brake failure.
Common Causes of a Sinking Brake Pedal
1. Brake Fluid Leak
One of the most common causes of a sinking brake pedal is a brake fluid leak. Brake fluid is vital for generating hydraulic pressure in your braking system. If there's a leak in any part of the system, the fluid level will drop, resulting in a soft or sinking pedal. This is a safety hazard that requires quick repair.
2. Air in the Brake Lines
Air can enter your brake lines if there's a leak or if the fluid level becomes too low. Unlike brake fluid, air is compressible. When air is present in the lines, you’ll feel a soft brake pedal that sinks to the floor when pressure is applied.
3. Worn Brake Pads or Shoes
When brake pads or shoes become excessively worn, the brake pedal may travel farther before engaging the brakes. If this is the case, you’ll need to replace the brake pads or shoes as soon as possible to restore normal brake function.
4. Faulty Master Cylinder
The master cylinder is the heart of your braking system—it generates the hydraulic pressure needed to operate your brakes. If the master cylinder is faulty, it may not be able to generate enough pressure, causing your brake pedal to sink.
5. Brake Caliper or Wheel Cylinder Problems
The brake calipers (in disc brake systems) or wheel cylinders (in drum brake systems) are responsible for applying pressure to the brake pads or shoes. A leak or malfunction in these components can lead to a sinking pedal.
6. Brake Hose Issues
Brake hoses are responsible for carrying brake fluid to the calipers or wheel cylinders. If these hoses are cracked, damaged, or deteriorated, they may collapse under pressure, causing a sinking brake pedal.
7. Faulty Brake Booster
The brake booster enhances the force applied to the brake pedal. If it malfunctions, you may experience a soft or sinking brake pedal, requiring more effort to stop the car.
This is just one of several common brake issues — see the 10 warning signs you may need a brake repair.
Diagnosing the Issue
Air in the Brake Lines
Air entering the brake lines typically occurs due to a leak or low fluid levels. If this is the case, you’ll need to have the brake system flushed and the air bled from the lines. Brake fluid can also absorb moisture over time, increasing the risk of air in the lines. Regular maintenance, including brake fluid changes, helps avoid this issue.
Leak in the Brake Lines
If you’re experiencing a sinking brake pedal, it could indicate a brake fluid leak. Brake lines are often made of steel and can rust, leading to small holes that cause fluid to leak. If you notice the brake pedal going to the floor, it’s time to inspect the brake lines for leaks.
Brake Caliper Leak
Brake calipers push the brake pads against the rotors when you apply the brakes. If your brake pads are worn too thin and the caliper piston is fully extended, it can result in a low pedal. A brake fluid leak from the caliper can also occur in this situation. You’ll need to have your calipers inspected and repaired to ensure they’re functioning properly.
Master Cylinder Leak
The master cylinder is responsible for sending hydraulic pressure to your brakes. If it starts leaking, either internally or externally, it will affect braking power, causing the brake pedal to sink. These leaks may not always be visible, so it’s important to have the master cylinder thoroughly inspected by a professional mechanic.
Leaking Wheel Cylinders
If your vehicle uses drum brakes, a leaking wheel cylinder can lead to a soft or sinking brake pedal. Like the brake caliper, the wheel cylinder helps apply pressure to the brake shoes. A leak in this part of the system will cause a loss in hydraulic pressure and should be addressed immediately.
Rear Brake Shoe Adjustment
A low brake pedal can sometimes be fixed by adjusting the rear brake shoes. Over time, constant wear can throw the shoe adjustment out of alignment. If this is the issue, pumping the brakes a few times may restore pedal pressure temporarily. However, a proper adjustment of the shoes is necessary for long-term reliability.
Low Brake Pad Wear
If your brake pads are worn down to their limit, the brake pedal might sink to the floor when pressed. You might also hear a screeching or squealing sound when braking. In such cases, it’s crucial to replace your brake pads immediately to ensure your brakes function safely.
What to Do If Your Brake Pedal Goes to the Floor?
If your brake pedal feels soft, spongy, or sinks to the floor, do not delay. A sinking brake pedal could signal a serious problem with your braking system. Ignoring it can put you at risk of brake failure, leading to accidents or worse. The moment you notice this issue, take your vehicle to a certified mechanic immediately for a thorough inspection.
Fix Low Brake Pedal Issues at Our Certified Brake Shop Locations
A low brake pedal is not something to take lightly. Our certified mechanics specialize in diagnosing and resolving brake system issues to restore your braking performance and safety. Whether it’s a leak, air in the brake lines, or faulty components, we’ve got you covered. Don’t let brake problems put your safety at risk. Contact us today for a professional inspection and brake repair service!
Want professional help? Find out more about our brake repair service.
Safe driving and all the best!