Give the rotor a sand and clean then make sure you bed the new pads in properly.
This.
A really good clean, otherwise pads may get contaminated again (or get new rotor is the surface is showing wear).
And don't hold onto the brakes when you come to a full stop to prevent burning out the pads.
@snottyotter started
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Give the rotor a sand and clean then make sure you bed the new pads in properly.