Core is an acronym for Cash On REturn. A sum of money is refunded for a rebuildable part that's exchanged for a rebuilt part of the same type. A common CORE charge is for brake shoes that need relining.
An acronym for "Cash On Return". Rebuildable parts that can usually be redeemed for a portion of their original purchase price. CORE charges are usually collected for engines, crankshafts, alternators, radiators and brake shoes.