Operations Management and Strategic Management · Economics of Maintenance and Spares Management

Types of Maintenance: Breakdown, Preventive, Predictive and Corrective

Updated 10 October 2026 · Fact-checked

Maintenance is the work done to keep plant and equipment in working order. The main types are breakdown (run until failure, then repair), preventive (scheduled servicing), predictive (act on condition monitoring) and corrective (fix a fault to restore or improve performance). Choose the type by cost of failure, safety and how critical the machine is.

Understand Types of Maintenance

Maintenance means the activities that keep machines, buildings and equipment in a condition to do their job. Without it, machines stop, output falls, quality suffers and costs rise. Maintenance management plans and controls these activities at the lowest total cost.

The objectives of maintenance management are to keep plant available and reliable, to reduce breakdowns and idle time, to extend the life of assets, to protect safety of workers, to maintain product quality, and to keep the combined cost of maintenance and downtime as low as possible. Note the last point: the aim is not the lowest repair bill, but the lowest total cost.

The four types differ in when you act:

Breakdown maintenance (also called run-to-failure): you repair only after the machine fails. No planning, no upfront cost, but failures come at random times, stop production and can be costly or unsafe.
Preventive maintenance: you inspect, lubricate, adjust and replace parts on a fixed schedule (by time or running hours), before failure. It cuts breakdowns but may replace parts that still had life left.
Predictive maintenance: you monitor the actual condition of the machine, using vibration, temperature, oil analysis or similar readings, and act when the readings show a fault is developing. It is also called condition-based maintenance. It avoids both surprise failures and unnecessary servicing, but needs instruments and skilled staff.
Corrective maintenance: you carry out work to remove a fault found during inspection or operation and restore the machine to its required state. Some books also use it to include improving the design to stop the fault recurring. Be careful: in many texts, breakdown repair is itself a form of corrective action, so read the question's wording and write your own definition.

Which to use depends on the cost of failure. For a critical machine on a continuous line, a failure is very costly, so use preventive or predictive. For a cheap, easily replaced item with a standby, breakdown maintenance is the sensible choice.

Key rules to remember

Total maintenance-related cost: Total cost = Cost of maintenance + Cost of breakdown (downtime, lost output, repair); The aim is to minimise this total, not either part alone. More preventive work raises the first part and lowers the second.
Choice rule: Prefer preventive or predictive maintenance when the cost of failure is high; prefer breakdown maintenance when failure cost is low; A rule of thumb for answers. Always check the figures if the question gives costs.

How to solve Types of Maintenance questions

Use this method for any question on types of maintenance, whether it asks for definitions, comparison or choice of policy.

1Read the verb: define, distinguish, explain advantages, or recommend. Plan the answer format from it.
2Define each type asked in one clear line, stating when the work is done (after failure, on schedule, on condition).
3State the objective or purpose of each type in a short phrase.
4List two or three advantages and limitations for each type, in bullet form.
5For a comparison, use points such as timing, planning, cost, downtime, suitability. Cover the same points for each type.
6For a recommendation, link the type to the machine's criticality, cost of failure, safety and availability of standby.
7Close with a one-line conclusion naming the policy and the reason.

Quickest way: Timing and criticality shortcut

When to use it: Use for MCQs and for short-note answers when time is tight.

Ask: when is the work done? After failure means breakdown; on a calendar or hours schedule means preventive; on measured condition means predictive.
If the work is fixing a found fault to restore working order, think corrective.
If the machine is critical and failure is costly or unsafe, rule out breakdown maintenance.
If the question mentions sensors, vibration or monitoring, the answer is predictive.
In a written answer, give definition, advantage and limitation for each type in that order.

Common mistakes in Types of Maintenance

Treating preventive and predictive maintenance as the same thing.
Both act before failure, so they sound alike.
Fix: Preventive follows a fixed schedule regardless of condition. Predictive follows measured condition. Write this contrast in every comparison.
Saying breakdown maintenance is always bad or always cheapest.
Students memorise one side of the argument.
Fix: It suits non-critical, low-cost items with standby. It is costly for critical machines because of downtime and safety risk.
Stating the objective as only reducing maintenance cost.
The word cost dominates the topic.
Fix: State the objective as minimising total cost, including downtime and lost output, along with reliability, safety and asset life.
Confusing corrective maintenance with breakdown maintenance without explanation.
Both involve repairing a fault, and books differ.
Fix: Give your definition: corrective work removes a fault to restore the required condition. Mention that breakdown repair happens only after failure.
Listing advantages with no limitations.
Students think the question asks only for the positives.
Fix: Add one limitation per type, for example preventive may replace parts early and predictive needs instruments and skills.

Worked examples

Example 1

Distinguish between preventive maintenance and breakdown maintenance. (Answer in a structured form.)

Show the solution

Define: preventive maintenance is planned servicing done at fixed intervals before failure; breakdown maintenance is repair done only after the machine fails.
Timing: preventive is before failure on a schedule; breakdown is after failure.
Planning: preventive needs a schedule and records; breakdown needs no advance planning.
Downtime: preventive downtime is planned and can be fitted into idle periods; breakdown stops production unexpectedly.
Cost: preventive has regular spending and may replace parts early; breakdown has no routine spending but high repair and lost-output cost when failure occurs.
Suitability: preventive suits critical machines and continuous processes; breakdown suits non-critical, cheap, easily replaced items.

Answer: Preventive maintenance acts on a schedule before failure and gives planned downtime and reliability. Breakdown maintenance acts after failure, needs no planning, but risks sudden stoppage. Use preventive for critical equipment and breakdown for low-cost, non-critical items.

Example 2

A bottling plant has a filling machine on its main line, whose failure stops the whole plant, and a small hand-operated label stamp with two spares in stock. Recommend a maintenance type for each, with reasons.

Show the solution

Filling machine: it is critical because a failure halts all output, so the cost of failure is high.
Choose predictive maintenance if condition can be monitored (vibration, temperature); otherwise preventive maintenance on a fixed schedule.
Reason: both reduce surprise failures and keep the line available.
Label stamp: failure is cheap, replacement is quick and spares exist, so downtime cost is low.
Choose breakdown maintenance; routine servicing would cost more than the loss it prevents.
Add that corrective action should still be taken on any fault found in either item.

Answer: Use predictive (or preventive) maintenance for the filling machine because failure is very costly, and breakdown maintenance for the label stamp because failure cost is low and spares are available.

Exam tips

Write the one-line trigger for each type (after failure, on schedule, on condition). Examiners look for it first.
In comparison questions, use the same points for every type and present them as short bullets.
For objectives, mention availability, safety, asset life, quality and minimum total cost.
In MCQs, watch for keywords such as monitoring, vibration or run-to-failure; they point straight to the type.
If a question gives a scenario, always justify the choice with criticality and cost of failure.

Practice questions from Economics of Maintenance and Spares Management

Types of Maintenance: frequently asked questions

What is the difference between preventive and breakdown maintenance?

Preventive maintenance is scheduled servicing done before a machine fails. Breakdown maintenance is repair done only after failure. Preventive gives planned downtime, while breakdown can stop production without warning.

What is predictive maintenance vs preventive maintenance?

Preventive maintenance follows a fixed time or running-hour schedule. Predictive maintenance uses actual condition readings, such as vibration or temperature, to decide when to act. Predictive avoids unnecessary servicing but needs monitoring tools.

What are the objectives of maintenance management?

The objectives are to keep plant reliable and available, reduce breakdowns and idle time, extend asset life, ensure safety, maintain product quality and minimise total cost. Total cost includes downtime, not just repair spending.

Is corrective maintenance the same as breakdown maintenance?

Not always. Corrective maintenance removes a fault to restore the machine to its required state. Breakdown maintenance is repair after failure. Books differ, so state your definition clearly in the answer.