Key takeaways
Short answer: Breakdown and preventive maintenance are opposite philosophies of when to act. Breakdown maintenance — also called reactive or run-to-failure — does nothing until equipment fails, then repairs it. Preventive maintenance services equipment on a planned schedule to prevent failures before they happen. Breakdown maintenance avoids upfront effort but pays for it in expensive unplanned downtime; preventive maintenance spends planned effort to avoid those costly surprises. For most critical equipment, shifting from breakdown to preventive is a major win. For the strategies beyond preventive, see preventive vs predictive maintenance.
Breakdown maintenance — also called reactive or run-to-failure maintenance — is the simplest possible approach: do nothing to a piece of equipment until it fails, then repair or replace it. There is no schedule, no inspection, no intervention until something breaks. Its appeal is that it requires no upfront effort or planning — you spend nothing on maintenance until a failure forces you to. For genuinely non-critical, cheap, easily-replaced equipment, this can even be a deliberate, sensible choice (a planned run-to-failure strategy). But applied to important equipment, breakdown maintenance is the most expensive way to operate, because the failures it waits for arrive unplanned, at the worst times, and bring a cascade of costs that the apparent upfront saving never covers. Reactive maintenance trades a small, visible saving now for large, unpredictable costs later.
Preventive maintenance takes the opposite stance: service equipment on a planned schedule — by time or usage — to prevent failures before they happen, rather than waiting for them. You define maintenance tasks (inspections, lubrication, part replacements, adjustments) and perform them at set intervals regardless of whether the equipment appears to need them that day, on the basis that proactive care prevents most of the failures reactive maintenance waits for. Preventive maintenance has a real, ongoing cost — the labour, parts, and planned downtime of the scheduled work — but it converts the expensive, unplanned failures of breakdown maintenance into cheaper, planned, scheduled interventions. It is the foundational proactive strategy, trading a manageable, predictable cost now for the avoidance of the larger, unpredictable costs of failure later. For most important equipment, that trade strongly favours prevention.
The fundamental distinction is timing relative to failure: breakdown maintenance is reactive (act after failure), preventive maintenance is proactive (act before failure). This drives the whole cost comparison. Breakdown maintenance has no scheduled cost but pays in full when failure strikes — and the cost of a failure is far more than the repair itself. Preventive maintenance has a scheduled cost but largely avoids those failures. The crucial insight is that the visible cost (maintenance effort) is the small part; the hidden costs of failure (unplanned downtime, rushed repairs, collateral damage, lost production) are the large part, and breakdown maintenance maximizes exactly those hidden costs. This is why the apparent cheapness of reactive maintenance is an illusion for any equipment that matters: you save a little on planned effort and pay a lot on unplanned failure.
Take a critical bearing on a production line. Under breakdown maintenance, you run it until it seizes — which it does mid-shift, unplanned: the line stops for hours while you scramble for the part and the technician, the seized bearing has damaged the shaft (collateral damage), and you have lost a large chunk of the day's production at the worst possible time. The repair itself was cheap; everything around it was enormously expensive. Under preventive maintenance, you replace that bearing on a schedule, during a planned window, before it fails — a short, planned stop, a cheap part, no collateral damage, no lost production at a bad time. The preventive approach cost a little planned effort and a scheduled part; the breakdown approach cost hours of unplanned downtime, a damaged shaft, and emergency response. The scheduled replacement was a fraction of the cost of the failure it prevented.
Breakdown maintenance is not always wrong — it is a legitimate, even optimal, strategy for the right equipment. For genuinely non-critical assets that are cheap, easily and quickly replaced, redundant, and whose failure causes little disruption, deliberately running them to failure can be the most economic choice, because the cost of preventing their failures would exceed the cost of the failures themselves. The key is that this should be a deliberate decision, not a default. The error is applying breakdown maintenance by neglect to critical equipment — running important assets to failure not because you chose to but because no preventive program exists. A mature operation decides, asset by asset, where breakdown (run-to-failure) is genuinely the right call and where preventive or more advanced strategies are needed, exactly the analysis behind reliability-centered maintenance.
The shift from breakdown to preventive maintenance is one of the most direct levers on the availability factor of OEE. Breakdown maintenance maximizes unplanned downtime — the single biggest availability loss for most plants — while preventive maintenance converts those failures into planned, scheduled work timed for minimal impact. The metric that captures the shift is the ratio of planned to unplanned downtime: as preventive maintenance raises it, availability climbs and the six big losses shrink. It also raises reliability (MTBF) by preventing failures and lowers repair time (MTTR) by making jobs planned rather than frantic. Moving the right equipment from reactive to proactive is often the fastest path to higher OEE.
Fabrico makes the cost of breakdown maintenance visible and the case for prevention concrete. By capturing downtime events and their reasons against live OEE, it quantifies exactly how much unplanned failure is costing in lost availability — the hidden cost that breakdown maintenance racks up — and which assets and failure modes are the worst offenders, so you know where shifting to preventive maintenance will pay off most. It then confirms whether the shift actually moved availability. Book a demo to see the real cost of running to failure.
Breakdown (reactive) maintenance fixes equipment only after it fails. Preventive maintenance services equipment on a planned schedule to prevent failures before they happen. Breakdown has no upfront cost but causes unplanned downtime; preventive spends planned effort to avoid those costly failures.
Yes, for genuinely non-critical assets that are cheap, easily replaced, redundant, and cause little disruption when they fail — deliberate run-to-failure can be the most economic choice. The mistake is running critical equipment to failure by neglect rather than by deliberate decision.
Because the repair itself is the small cost; the large costs are the unplanned downtime, rushed emergency repairs, collateral damage, and lost production that a failure causes at the worst time. The apparent saving on planned effort is dwarfed by these hidden failure costs.
For important equipment where failure is costly or disruptive. Preventive maintenance converts expensive, unplanned failures into cheaper, planned, scheduled work, which strongly favours prevention for any asset that matters. Non-critical assets may still be run to failure deliberately.
Shifting from breakdown to preventive maintenance reduces unplanned downtime, the biggest availability loss for most plants, by converting failures into planned work. It raises reliability (MTBF) and lowers repair time (MTTR), making it one of the most direct levers on OEE availability.
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