I have a 2000 Dodge Neon its a 4 cylinder and the other day my brakes went completely out. I checked the brake fluid and it was low so I bought more just to make it home (around the corner) and by the time I got home it was very low again. So an hour after I got it home I went outside and saw brake fluid on the ground it was under my driver's side back tired only. What does that sound like to you? I want to say it is the wheel cylinder but I am not 100% sure or maybe you think the brake line needs to be replaced or the it is just the caliper? Also is it best to change the back brake because of all the possible brake fluid on it? How much does it cost for the part typically. Thank you in advance! 
Thank you Thanatos! I know a little about cars from my newly ex husband he taught me a lot about cars. he normally does all this stuff and I watch closely but since he is gone I am left trying to figure all this stuff out. Thank you for the informative answer!
Thank you Thanatos! I know a little about cars from my newly ex husband he taught me a lot about cars. he normally does all this stuff and I watch closely but since he is gone I am left trying to figure all this stuff out. Thank you for the informative answer!