What's Corrective Maintenance ?

It improves equipment and its components so that preventive maintenance can be carried out reliably.

Equipment with design weakness must be redesigned to improve reliability or improving maintainability

Corrective Maintenance = Breakdown Maintenance....only

Corrective maintenance is a maintenance task performed to identify, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to an operational condition within the tolerances or limits established for in-service operations.

corrective maintenance is fixing an unexpected intervention to keep intact the performance level. It can be more useful if fixed on permanent basis to avoid the recurrence.  

1. Corrective maintenance is a maintenancetask performed to identify, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to an operational condition within the tolerances or limits established for in-service operations.
2. Definition of corrective maintenance: Activities undertaken to detect, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to ...

Corrective maintenance is repairing something after it has broken. It is reactionary If your tire has a puncture, you repair it. 

You also have scheduled maintenance such a changing your oil and air filters. 

There is also preventative maintenance, which is when you replace something so that it won't break. For an example, on an aircraft, the wings would be removed, inspected and replaced before they failed. 

Activities undertaken to detect, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to its normal operable state. Contrasted with preventive maintenance. Read more: http://www.businessdictionary.com/definition/corrective-maintenance.html#ixzz3Rqhgrgt2

Corrective Maintenance is an un-planned intervention to return an equipment of a system into normal operation.