Vibrations w/ disc brakes
I got a pair of Hayes CX disc brakes on my touring bike.
Brakes alright, only one uncomfortable/strange thing: front brake makes vibrations when braking: as it the pad was slipping on the disc before catching it for good, the phenomena is reduced if I apply the brake really gently and progressively, or if I keep it applied: at some point the vibrations stop.
Braking in rear is smooth.
What should I look into?
- clean the rotor in case it is compromised with any accidentally leftover grease or oil?
- sand-paper the pads?
- the rotor is a 6-screw one adapted on my centerlock hub with a Shimano 6-screw-to-centerlock adapter, should I verify the centerlock is tightened enough?
What else? I know for sure that cable and housing are clean and properly lubricated without any weird angle or whatever.
Any other idea?