my brake pedal goes soft?

2009 NISSAN MURANO
215,000 MILES • 3.5L • 6 CYL • 4WD • AUTOMATIC
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LIONELL8732
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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.
Feb 15, 2025 at 6:31 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
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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
Feb 16, 2025 at 8:57 PM
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LIONELL8732
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While holding the brake and plays why the car is on the pedal does not move.
Feb 17, 2025 at 8:02 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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.
Feb 19, 2025 at 9:45 AM
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LIONELL8732
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  • 150 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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Feb 20, 2025 at 8:20 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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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Feb 21, 2025 at 9:44 AM
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