My back left brake on my Linhai 300 has squeaked since I purchased new. It squeaks when NOT engaged and seems to come from the pad and is not constant so I figure rotor may be involved also. Doesn't seem to affect performance and goes away at higher speeds so I have lived with it. Is there a relatively easy adjustment to loosen the pad a bit so it doesn't squeak. Brake cleaner or water only work for a short time. Thanks for any help/advice. I work with computers so please keep it simple for stupid (me).