My honda four wheeler brakes squeak badly and I don't know how to fix it I changed the brake pads ?

I think what it is is the back brakes ain't releasing like they should but don't know how to fix itMy honda four wheeler brakes squeak badly and I don't know how to fix it I changed the brake pads ?I used grooved brake pads they push out mud and water EBC brand.You may have rust in the claipers or on the rotors try some brake cleaner spray then apply them real hard to remove any rust or glazing from heat.