How long do the replaceable brushes last? Support January 14, 2021 20:22 Updated Follow Answer Under most conditions the carbon brushes should last approximately 150 hours. Related articles Can I buy Black and Decker parts online? Where can I buy BLACK+DECKER Products in Canada? How can I obtain electrical components that have been discontinued like capacitors, armatures, brushes, switches, cords, etc? Is there an instruction manual available for the LDX172C cordless drill? Comments 0 comments Please sign in to leave a comment.