the brakes of a car lifted in the air

How to Troubleshoot Issues With Spongy or Unresponsive Brakes

What Does it Mean When a Car’s Brakes Feel Spongy?

When drivers notice an issue with their vehicle’s brake pedal, it should be addressed as soon as possible. What does it mean when a car’s brakes feel spongy? How can drivers troubleshoot issues with an unresponsive or spongy brake pedal? We’ve created a set of tips for you to follow if you’re experiencing this issue.


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When experiencing a spongy brake pedal, drivers there are several likely sources for drivers to investigate. One common reason is a buildup of air in the brake lines, which usually means your vehicle’s brake fluid needs to be flushed. A lack of brake fluid due to a leak (often caused by rust) can also result in an unresponsive brake pedal.

Your brake system’s various cylinders could also result in issues with unresponsiveness. If the master cylinder is worn out, the hydraulic pressure going to the brakes can be lost, resulting in a failing brake pedal. Leaking wheel cylinders can cause similar issues for your brakes.

A mechanic checking brake
A mechanic checking brake

Other Common Causes for Spongy-Feeling Brakes

Braking systems are complex, meaning there are a wide assortment of issues that could be the source of brake pedal problems. An automotive specialist will be able to help you accurately diagnose the issue. In addition to the causes listed above, other common causes include:

  • Damaged Brake Lines
  • Old & Degraded Brake Fluid
  • Damaged Disc Brake Caliper
  • Faulty Power Assist Mechanism

If you’re experiencing brake issues with your vehicle, Matt Castrucci Nissan in Dayton, OH can help you resolve it. Simply schedule a service appointment with us using our online scheduling tool and select a date and time that works best for you. We can help drivers with a variety of services, including automotive glass repair, tire rotation and engine air filter replacement.