Brake pedal goes to the floor after brake booster replacement?

2007 NISSAN PATHFINDER
200,000 MILES • V6 • 4WD • AUTOMATIC
Avatar
DDEKK9226
  • MEMBER
  • 1 POST
Brake pedal nonexistent after booster replacement.

Just replaced the brake booster for the vehicle listed above after recommendation from dealership for spongy brake pedal.
Beforehand it was spongy, but I was still able to feel pressure.
After replacing it I went ahead and bled the brakes, all of which had some amount of pressure. The back two bleeders were barely pushing anything out while the front ones were crystal clear with no air.
I see no leaks, and my fluid level doesn't seem to be dropping, but after replacement my pedal goes down with no effort and comes up slowly. Any thoughts?

I also want to mention i replaced the master cylinder a few weeks prior, it didn't change anything, but it also didn't affect the brakes negatively. (It was bench bled as well)
Apr 11, 2025 at 2:59 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
When you replaced the master did you bench bleed it? If not, I would, here is a video to help:

https://www.youtube.com/watch?v=WDxvEQrMkBg

Also, I would open the ABS valves while bleeding because you might have air in the ABS controller.

https://www.youtube.com/watch?v=nQRnKyVyMuQ

Also, you can go over this guide as well:

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

If you go over these it will help you fix the problem. Let me know wat happens or if you have any more questions.
Apr 13, 2025 at 10:37 AM