The fact that the gasket was swollen tells me someone put the wrong fluid in the system.
That means that every piece of rubber in the brake system has to be replaced and the system flushed.
This means master cylinder, ABS hydraulic unit, wheel cylinders, both of them, and all the brake hoses.
If you do not then the residual contaminated fluid will destroy all the seals on the replacement parts.
Roy
Monday, April 5th, 2021 AT 11:50 AM