Air in the lines
Air squeezes where brake fluid doesn't, so the pedal feels like a sponge. It gets in when the fluid runs low, or after brake work that wasn't bled properly.
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Brake answers
Why does my brake pedal feel soft or spongy?
The short answer
A soft or spongy brake pedal usually means air or moisture in the brake fluid, or a leak in a brake line, hose or caliper. Less often, the master cylinder is wearing out. Your brakes work by fluid pressure, so anything that lets the fluid squeeze or escape takes stopping power with it. Get it checked right away, and don't drive if the pedal sinks toward the floor.
From the Budget Brakes shops · Updated
What causes it
Old brake fluid
Brake fluid soaks up moisture over time, and water lowers its boiling point. In hard braking it can boil into vapor, which feels just like air in the lines.
A leak
A cracked hose, a rusted line or a leaking caliper lets fluid out. Look for a damp spot inside a wheel or a small puddle near a tire.
A worn master cylinder
The master cylinder turns your push on the pedal into pressure. When its seals wear, the pedal slowly sinks while you hold it at a light, even with no leak you can see.
Very worn pads
Thin pads, or rear brakes that need adjusting, make the pedal travel farther before the brakes bite. That feels low more than soft.
Check the fluid
With the engine off, find the brake fluid reservoir under the hood; your owner's manual shows where. If the level is below the MIN line, fluid is leaking or the pads are very worn. Topping it up isn't a fix: it only hides the reason.
Is it safe to drive?
If the pedal feels soft but the car still stops firmly, get it checked the same day and drive gently until then.
If the pedal sinks toward the floor, you have to pump it to stop, or the red brake warning light is on, don't drive. Have it towed.
How it's fixed
Air is bled out of the system, and old fluid is flushed out and replaced. A leaking hose, line or caliper is replaced, and so is a worn master cylinder. At Budget Brakes the free brake inspection includes a brake fluid check, and you get a written price before any work starts.
More questions
Can a soft brake pedal fix itself?
No. Air, moisture and leaks don't go away on their own, and the pedal usually gets softer over time.
Why is my brake pedal soft after new brakes?
Usually air was left in the lines, or the new pads haven't fully seated. Take it back to the shop that did the work right away.
How often should brake fluid be replaced?
About every 2 years or 24,000 miles, whichever comes first. The free brake inspection includes a fluid check. When to replace your brake fluid.
Your free brake inspection includes:
Worn outBrake pad thicknessBrand new
Measured, not guessed. New pads start around 12 mm. We start the conversation near 3 mm, and you see the number.
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