Okay this is my first bike with all hydraulic disk breaks and I don't understand something my front break was working fine the day before but when I woke up this morning and road to work it was just dead!! I mean there was just no power at all and when I did press down it made this horrible load horn sound I just don't understand how this could have happened I really take care of my bike it's like my child haha I mean does my front break need to be blead? I know I have to take it to the shop but does anyone know what the problem is? please someone help me. PS. they operate on mineral oil I don't know if that matters.

Sounds like your brake line may have developed a leak. Do you have any oil on any of your lines or where you stored it? You may also have an obstruction in the line. I'd take it to your local LBS and ask them to take a look at it.

Yes that makes sense but I don't know how there could be a leak but I will inspect it and see, thanks for your advise.

You may have better luck asking this question on the mechanics forum. FYI, use the word brakes instead of breaks. People on here will derail your thread if you use an incorrect word....

Also could be an air bubble , Hydraulic disk brakes are the same mech on an MTB as they are on a car,
there is a slave cylinder , an opposing pair pinching the disc, usually,

and a fluid reservoir with a supply tank and expansion capability as fluid volume gets bigger when heated.
and a hand lever attached to the master cylinder.

You may have to bleed the air out of the brakes .. unlike a car in normal use you wont be turning it, the car, over.
but turning the bike upside down is a good way to introduce air..

From the OP it sounds like his disc pads have worn down to metal--thus the lack of stopping power and 'horrible loud horn sound'. Might just need a new set of pads (if rotor was not damaged by metal-to-metal contact). JMO