Odd master cylinder issue

1972 Chrysler Newport.
Yesterday, some genius pulled out in front of me and I had a hard stop. "BRAKES" idiot light came on for a second then went away. I pulled into a parking lot, and started simple. I checked fluid first. It is a dual master with power disc brakes. When I checked fluid, the reservoir for the rear brakes was almost empty, and the reservoir for the front was way full and spilling out of the top. I then got both of them to the same level. Went on a drive, plenty of stops....

Odd master cylinder issue
Author: Jon O.