I'm trying to change front brake pads and after I took the old pads out I was unable to fit the new ones in. The would almost fit but not quite so I decided to put the old ones back in but now they would not fit for the same reason the new ones wouldn't. I'm obviously doing something wrong but can't figure out what, I tried for 3 hours to fit them in but just couldn't get them to fit. Anyone know what I might be doing wrong? HELP