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Noticed rubber diaphragm under Master cylinder cap looks "sucked" in

Tiny
TONY3
  • MEMBER
  • 2007 FORD EXPEDITION
  • 43,000 MILES
Changed master cylinder 3x's already at dealer. ABS module changed. Bled lines 3 times to bleed back. Noticed rubber diaphragm under master cylinder cap looks "sucked" in. Brakes travel down and stay at a fixed position, not all the way down, and stops with no slow moving.
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Sunday, October 9th, 2011 AT 11:47 PM

1 Reply

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

This is from a low fluid level.

You need to have the system inspected for leaks. The low pedal is also the result of the low fluid level. I no leak is found; the master cylinder is most likely the issue.

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

Let me know if you have any other questions.

Roy
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Friday, March 4th, 2022 AT 5:35 AM

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