Beeping at start up with All Brake Lights on?

The expensive brake parts are kind of known to be somewhat problematic you will definitely be need to get in the codes because you're going to probably have a bunch of brake codes. That you will need to sort through and eliminate one by one.

 

While there are around a couple hundred possible brake trouble codes, most of them only light the warning lights; only a handful of them also sound the alarm beep. Those are mostly the ones about the fluid pressure being too low to assist you with braking (which you can tell the car isn't just imagining, because you have to press really hard to brake).

Usually when you come to the car in the morning to start, it has been sitting long enough for some fluid pressure to have bled off, and the pump has to run to replenish it. If the pressure had bled off low enough to sound the alarm, you'll get that beeping for some matter of seconds until the pump has pushed the pressure back up where it should be, and then the alarm and the lights go away, as you described in the first sentence.

If the alarm and lights just stay on, then the pressure is never getting above the threshold. Either the pump is not running, or it is running but too worn to pump effectively, or it is pumping but there is an internal leak somewhere fast enough that the pump can't even overtake it.

Reading the trouble codes will still get more details for the story, but the basic outlines are taking shape.