I recently bought my first bike 2006 Kawasaki GPX250 and i'm not sure what brake fluid to use. After reading the service manual it only mentions using DOT3 brake fluid so I went out and bought some and as i was about to drain the old fluids I notice on the front brake resovior it says use only DOT4 fluid... So now im unsure of what fluid to use. Is there any harm in putting DOT3 in? All the information I have found from google has been that they are interchangable and DOT4 just has a higher boiling point over DOT3.