Hi,
The brake pedal will become hard to press if you press them without the engine running. Power assist is provided via engine vacuum so without it running, that isn't available.
Does anything electrical work? Based on your description, it sounds like the battery may simply be dead.
Try this simple battery load test. It doesn't require any tools. Follow the directions in this link and let me know the results.
https://www.2carpros.com/articles/car-battery-load-test
Let me know what you find.
Take care,
Joe
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Tuesday, October 4th, 2022 AT 7:36 PM