For all practical purposes, rebuilding auto parts is very much like assembling new parts except that many of the components are taken from used parts, especially the housing. In rebuilding, the part must be completely disassembled, cleaned and examined for wear and breakage. Worn out, missing or nonfunctioning components are replaced with new or rebuilt components. Electrical parts frequently need rewinding or rewiring. After all work is done, the part is reassembled and tested for compliance with performance specifications.
Rebuilt parts are readily available through auto parts stores.
For most makes and models these stores keep a supply of rebuilt parts in stock so there will be no delay in servicing the vehicles of owners who use them. In fact, it is interesting that an examination of the inventory of almost any automotive supply store will reveal that a majority of parts in stock are rebuilt. These parts stores and warehouses, of course, always offer a choice or new or rebuilt parts. As a result, the use of rebuilt products in the aftermarket has increased steadily for the last 20 years until now, for those items which are rebuildable, rebuilt parts enjoy a major share of the market. Rebuilt parts are also available for heavy duty equipment such as bus and truck fleets, farming equipment and construction equipment.