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Brake pedal goes to the floor?

Tiny
E46KID
  • MEMBER
  • 1997 TOYOTA 4RUNNER
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 269,000 MILES
I replaced the mater cylnder due to having no brake pressure and after replacement I bleed the brakes 4 times to make sure all the air is out of the system. I blead them in this order RR RL FR FL. And now if I lightly press the brakes the pedal will go to the floor but if I press hard on the brakes it will only go about half way and hold pressure fine. I have checked for leaks and have not found any. Would a bad brake booster be the caues or do would I have a very small leak somewhere?
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Saturday, May 13th, 2023 AT 7:28 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
A bad brake booster will not cause the pedal to go to the floor. Here is a guide to help can I ask if this truck has ABS if so, the ABS system valve need to be opened while bleeding, here is a video and guide to help. If you don't have ABS please check the caliper slides to make sure one is not seized up.

https://youtu.be/nQRnKyVyMuQ

and

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

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Monday, May 15th, 2023 AT 11:05 AM

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