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Randomly brake pedal slowly goes to the floor

Tiny
JRENNHACK
  • MEMBER
  • 2006 TOYOTA CAMRY
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
I change rear caliper. Bled brakes and went for a drive. And the brake pedal all of the sudden went straight to the floor. I let off hit it again and it was fine. Then next time it went down slowly to the floor. Basically just randomly works fine then bam doesn't. There is no leaks at all anywhere. No air in the system for sure. Could a collapsed hose cause this or a bad master cylinder? Even though there is no leaks of any kind that's noticeable?
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Sunday, February 16th, 2020 AT 10:14 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Yes, this sounds like a bad master cylinder.

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

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Common for the symptoms you described.

You will need to replace the cylinder, bench bleed the cylinder and then bleed the lines. If you have ABS, you will need to have a scanner that can allow the ABS unit to be bled or you will not be able to get the air our of the lines.

Roy
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Friday, March 5th, 2021 AT 10:50 AM
Tiny
JRENNHACK
  • MEMBER
  • 3 POSTS
Okay, guess that's what I'll replace next. Hopefully it solves the issue.
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Friday, March 5th, 2021 AT 10:50 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If you do not have an external leak, it would point directly to the master cylinder.

Roy
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Friday, March 5th, 2021 AT 10:50 AM
Tiny
JRENNHACK
  • MEMBER
  • 3 POSTS
That's what I thought just figured better to ask and be 100% sure. Thank you. Hopefully this will fix the problem.
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Friday, March 5th, 2021 AT 10:50 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Friday, March 5th, 2021 AT 10:50 AM

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