My brake pedal goes soft?

Tiny
LIONELL8732
  • MEMBER
  • 2009 NISSAN MURANO
  • 3.5L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 215,000 MILES
Hello, I have a braking question. Every time I put my vehicle in reverse then back to drive my brake pedal goes soft to where I have pressed the pedal all the way to the floor. I just changed the brake master cylinder. I checked for leaks and air pockets. There are no leaks or air pockets.
Saturday, February 15th, 2025 AT 6:31 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

Is the brake pedal firm before shifting to gear? Are you certain nothing is leaking? Also, try something and let me know the results. Start the engine and allow it to remain in park. Place pressure on the brake pedal and hold it. Does the pedal slowly go to the floor under these conditions?

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

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

Let me know what you find.

Take care,

joe
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Sunday, February 16th, 2025 AT 8:57 PM
Tiny
LIONELL8732
  • MEMBER
  • 147 POSTS
While holding the brake and plays why the car is on the pedal does not move.
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Monday, February 17th, 2025 AT 8:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,264 POSTS
I would remove the wheels and check the caliper slides; it sounds like one of them is seized. Please go over this guide to see what I am talking about:

https://www.2carpros.com/articles/discover-why-automotive-brake-pads-wear-unevenly

Please go over this guide and get back to us.
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Wednesday, February 19th, 2025 AT 9:45 AM
Tiny
LIONELL8732
  • MEMBER
  • 147 POSTS
Every time I go in reverse and also I hear some grinding from the front left tire as I make a turn and it's scratcheing my rotor up badly.
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Thursday, February 20th, 2025 AT 8:20 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,264 POSTS
Okay, let's raise the front of the car to check the bearing hub, grasp the tire and try to move it back and forth, up and down to see if there is play in the bearing. If so, here is the part that needs to be replaced.

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Check out the images (below). Let us know what you find.
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Friday, February 21st, 2025 AT 9:44 AM

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