When ordering this item, also order the Core Charge (> "Quick Find"): # 622000161When purchasing this item you will be charged € 55 deposit for the old unit, which will be refunded after you return the non-disassembled old unit within two (2) weeks to us in the box of the reconditioned one (at your expense)! Use DOT3 Brake Fluid only (Pay attention to specification given on cap)!