Brake pedal goes all the way to floor, with no leaks

Tiny
GREG SCHULZ
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
No check ABS comes on on dash. No fuse issues. I’m at a total loss. Thought it was master brake cylinder but I just replaced it a year ago.
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Sunday, April 28th, 2019 AT 2:29 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

If there are no leaks or fluid loss, it has to be the master cylinder has failed again. Take a look through this link:

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

If you read through that and determine it is the MC, here is a link to help with replacement:

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

_______________________________________

I attached an exploded view of the MC for you to see. Honestly, if there are no leaks and the fluid remains full, this is my first suspect.

Let me know if you have questions or need help.

Take care,
Joe
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Sunday, April 28th, 2019 AT 6:09 PM
Tiny
GENERAL.MOTORS
  • MEMBER
Check for faulty caliper, may piston won't move
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Monday, April 29th, 2019 AT 12:52 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Honestly, if you have a stuck piston, that won't cause the brake pedal to drop to the floor.

Let me know what you find.

Joe
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Monday, April 29th, 2019 AT 6:58 PM
Tiny
GENERAL.MOTORS
  • MEMBER
Hello jakob, I faced the same problem and noticed that one piston won't move, changed it and the brake pedal start to be normal
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Tuesday, April 30th, 2019 AT 11:14 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
It went to the floor? In my mind I can't see how that would happen. Not saying it couldn't.
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Tuesday, April 30th, 2019 AT 7:27 PM

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