Brake pedal.

Lately my brake pedal has been going down to the floor when I depress it. I figure it's some air in the lines. Where is the master cylinder and bleeder screw? Also whats the procedure to release the air?
Thx.

It COULD be air in your lines, but that would mean you have a leak somewhere. Have you checked your brake thickness lately, whats it at? The bleeder screw for disc brakes is on the caliper. The bleeder screw for drums is on the back of the backing plate, opposite the wheel cylinder. Check your pads and rotors before you do anything else. Worst case scenario you could have a bad vacuum booster.

So if there is air in the lines, that means that after I bleed it eventually it will find its way back in?. My brake pads are only a couple months old. Is there anyway to check the vacuum booster to see if it's working properly? Also where is the location of the vacuum booster?

Chances are if this is something that just started happening and you check ya lines, calipers, slave cylinders and there are no leaks. Your master cylinder is no good.

Chances are if this is something that just started happening and you check ya lines, calipers, slave cylinders and there are no leaks. Your master cylinder is no good.
If so whats the cost on a new master cylinder?