Brake pedal fades to floor with engine running

Hi,

If the brakes pump up and then slowly go to the floor, either you have a leak or another bad master cylinder. Does the fluid go low?

Take a look through this link and let me know if it helps:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Let me know. Remember, this is a sealed system. For the pedal to go to the floor, there has to be a leak or issue with the master cylinder.

Take care,
Joe

The brake going to the floor is normally a sign of a leak or air in the system. Have you done any repairs on this vehicle recently?

Here is a guide that will help explain this:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Basically we need to look for external leaks and then bleed the brakes assuming the reservoir is full.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

I suspect we are dealing with a master cylinder issue that may have an internal leak if you don't find any leaks and have not made any repairs.

Let me know and we can go from there. Thanks

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