Skip to content
EN · km
Language
Units
My Garage

Soft Or Spongy Brake Pedal

A brake pedal that feels soft, spongy or sinks further than usual means air in the brake system, a fluid leak, old fluid or a master cylinder fault.

Short answer · Is a spongy brake pedal dangerous?

Yes. A pedal that sinks or feels spongy means the hydraulic system is not transmitting pressure properly. Causes include air in the lines, a leak, boiling old fluid or a worn master cylinder. Have the car checked before using it, and recover it if the pedal goes close to the floor.

On this page

Safe checks you can do

  1. Check the brake fluid levelA low level suggests a leak or very worn pads.Do not drive if the level is below minimum or the pedal sinks.
  2. Look for wet wheelsFluid on the inside of a wheel or tyre.
  3. Press the pedal with the engine offA pedal that slowly sinks under steady pressure points to the master cylinder.

Questions that narrow it down

  1. Is the brake warning light on?Low fluid.
  2. Did it start after brake work?Air left in the system.
  3. Is it worse after hard braking?Old fluid boiling.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Air in the brake linesAfter repairs or leaks.
  2. Brake fluid leakHoses, pipes or calipers.
  3. Old fluid with waterBoils under heavy braking.
  4. Master cylinder wearPedal sinks slowly.

Questions about Soft Or Spongy Brake Pedal

How often should brake fluid be changed?

Follow the service schedule; many manufacturers specify every two years.

Can I bleed brakes myself?

It is a safety-critical job; if in doubt, leave it to a workshop.