2003 LeSabre

Brakes went on me, from one stop sign where it was working to the next when it was hardly anything.

I have probably 10 or 20% breaking.

I don't see any leaking anywheres, also the reservoir is full.

Anything that might be electrical, or a hose?

I noticed on the reservoir there'* a wire that goes up to it not sure what that is or what it does.
In any case the question is if you're not leaking fluid what else would cause the pedal to go down all the way and hardly break it all.

If there was no previous repairs done, i'd suspect the master cylinder is bypassing itself. Highly suggest not driving this until its remedied.

How many miles on the car?

How many miles since the most recent brake work was done?

Who did the most recent brake work on it?

Have the brakes made any noise recently?