Why Does My Brake Pedal Feel Spongy?

Stepping on the brake pedal and feeling it sink to the floor can be quite unsettling for a driver, 

There are various causes for spongy/soft brakes, primarily caused by air in the hydraulic system, which prevents effective force transfer when braking. Brake issues require immediate attention, it’s essential for your safety and others.

Causes of Spongy Brakes

When the brake pedal sinks below your foot, and you’re pumping the pedal repeatedly to stop the car indicates a brake problem. This is a big problem, spongy brakes are most commonly caused by air in the brake lines, but could also be caused by a list of various other factors.  

Air In The Brake Lines

Air in the brake lines is the most common cause of a spongy/soft brake. When air gets into the brake lines, it prevents fluid from flowing properly, causing the brake pedal to feel spongy. The best thing you can do is change or flush the brake fluid. Which protects and preserves other major brake components.

Leaking Brake Line

Over time, brake lines can become corroded by rust, allowing small holes to develop and leak brake fluid. The loss of brake fluid lowers your hydraulic pressure, causing the brake pedal sink to the floor. 

Damaged Brake Calipers 

Similar to brake lines, disc brake calipers corrode with rust over time, causing the internal piston seal to leak brake fluid. It can cause the brake pedal to be alarmingly low, dropping the brakes to the floor.  

Worn Master Cylinder

The master cylinder performs several key functions within your brake system. It holds brake fluid, generates hydraulic pressure, and streams power into the front and back brake systems. 

When the master cylinder wears out, it can develop leaks. There are two types of master cylinder leaks, one an external brake fluid leak, the other an internal leak from a damaged piston seal.

Wheel Cylinder Leak

If there is corrosion inside your vehicle’s wheel cylinder, it can cause brake fluid to leak, resulting in a loss of hydraulic pressure, which will inevitably cause soft brakes.    

Rear Brake Shoes Adjustment

The rear brake drum/shoe system is vital in operating your car. Sometimes, as the rear brake shoes wear, they aren’t properly aligned, and when out of alignment can cause the brakes to feel spongy. We recommend getting your rear brake shoes checked for wear and adjusted as needed. 

ABS System Malfunction

ABS-operated cars have a hydraulic assembly that contains multiple internal solenoids and valves. An internal failure, corrosion, or debris in the brake fluid can cause the system to not operate properly.

Brake Services in Tucson, AZ

If your vehicle needs a brake inspection or replacement, look no further than Micro Import Service in Tucson, Arizona. Our expert import technicians will ensure your brakes are in the proper condition and that your vehicle is safe to drive! Don’t hesitate to give us a call or schedule online with us today!