I was changing my brake pads and by mistake took of my brake line screw. now that I have put everything back together my brakes goes down to the floor. I tried bleeding that side, but still the same thing.........please help.

 

What car?

 

yea that happened to me well not the took wrong screw out but the need to bleed brakes. First check ur brake fluid reservoir, mine had dropped a lot and then re-bleed both sides L & R of whatever part of the car it was (F or B). If that doesnt help, do all 4. Air gets into everywhere... oh yea, bleed the same caliper several times, once or twice is not enough.