For more information and reaction mechanisms, look at the link below. www.sciencemadness.org/talk/files.php?pid=75149&aid=1734 PEG is chosen as a hydraulic brake fluid for its very high boiling point. Usually over 400f. So this is a very exothermic reaction! Something I noticed. If the hypochlorite or brake fluid contains an appreciable amount of water you will not get a fire, instead you will get a very thick white smoke that is probably toxic.