EDIT - SPELLING
So now after the fact, hindsight is 20 / 20.
While $440 sounds a bit steep (for my blood anyways) in the end you dodged a bullet. Pouring a bottle of brake fluid in would've just gone out the exploded hose right onto the ground.
Thinking that you would have filled up the brake reservoir maybe not noticing the leak, you would've jumped in the car and gone down the road and the first time you hit the brakes it would've been pedal to the floor and some serious butt cheek puckering.
I'm glad for you that the outcome is the way it is right now.