Hi,
Drums are different than hubs. When the new Master Cylinder was installed, was it bled properly? Also, are there any leaks under the vehicle that you, see? Is the brake fluid staying full?
Take a look through this link and let me know if it helps. Also, let me know what all has been done to this point. For example, was the new master cylinder bench bled? Also, was the system bled?
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Let me know.
Joe
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Saturday, July 23rd, 2022 AT 10:51 PM