Q: Brake pedal goes soft

asked by on

The brake pedal goes soft, but I can pump up the brake.

I have seen this before. It is usually caused by an internally leaking master cylinder. The master cylinder is where the pressure for the entire brake system is developed. If it leaks internally, your pedal goes down, if you release it and step on it again you can build up some pressure. Eventually if you keep your foot on the pedal, it will go down again. Replacement of the master cylinder is the usual repair. This requires opening up the hydraulic system and bleeding any air that may be trapped in the lines. Not doing so will leave you with a very spongy feeling pedal. I suggest seeking the help of a qualified mechanic, such as one from YourMechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Brake pedal goes soft

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: 4Runner has no power in the engine.

Check the engine for a vacuum leak and see if the valve on the brake booster is leaking. Also check the EGR (Exhaust Gas Recirculation) is stuck on all the time. A vacuum leak or the EGR being stuck on...

Q: My Check Engine Light is on - 2001 Toyota 4Runner

Hi there: When the traction control light comes on (and the system is not engaged manually), it's usually an indicator of a wheel sensor or transmission speed sensor issue as both of these parts are critical for monitoring and controlling...

Q: Sinking brake pedal in an O1 Lincoln Town Car

Of course, with the sinking brake pedal, you'd want to start with the most logical suspect - a brake fluid leak. Pull the tires off and see if anything's leaking. Look for the dripping fluid. If you don't find anything...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...