I have a 04 Fuji outland disc with promax brakes. Got the bike used last night and the brakes were loose enough that i could push it while yanking the breaks and they tires still rolled easily. I took the pads out and scuffed them pretty good with sand paper as well as the rotors put everything back together and attempted to readjust them (first time dealing with disc ever) Got them quite a bit tighter but still can only barely get the rear to lock (only for a second or 2 on gravel) and they front is still pretty soft. Is it supposed to be like this? Like i said i have never messed with disc before so maybe i expect to much from them but I have a old schwinn mountain bike that i can stand on its nose and balance there and it just has some old tektro side pull brakes. Any advice?