no lubes needed, they are for anti squeeling and for sliding piston calipers.
yes you only need to bed them the first tie you put them on to bond the new pad in (this is from a former indycar driver). thats why race teams usually bed a batch of pads in during test sessions.
you sure you didnt have a rock stuck between the pad and rotor?
vibration comes from deposits on your pad or rotor
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