I just changed the master cylinder on my Buick and refilled the ac. The other day it was about 100 degrees so I had my ac blowing and I noticed it would make a strange noise everytime I would step on it and then I realize my car was leaking brake fluid so I decided to put it back in the garage and today I was checking on it and I see this oily bright green fluid under my car. And when I step on the gas and release it it makes a noise but only with the ac. Thx and I hope u guys can help me