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

2007 FORD EXPEDITION
43,000 MILES
Avatar
TONY3
  • MEMBER
  • 1 POST
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.
Oct 9, 2011 at 11:47 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 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
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Mar 4, 2022 at 5:35 AM