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: Car won't start with a loud clicking sound coming from starter

A starter like any other mechanical and electrical part is subject to failure sometimes for no apparent reason. However, sometimes this is misdiagnosed as well and often mistaken for something much more simple like a fuse or starter relay. ...

Q: I drove my car about 50 miles without the oil cap it started rattling and cut off and now it wont crank

Having driven that far with no oil cap, it is likely that the engine oil level ran low enough to cause engine damage, possible seizing the engine. If that is what happened, adding oil will not help once the engine...

Q: Q: Brake pedal going to the floor

The brake pedal pushes on a rod that goes to the master brake cylinder. This, in turn, sends brake fluid to all of the wheels through the lines to the brakes at each wheel. If your pedal is going to...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.