If there’s one area where we’re consistently seeing corners being cut across MOT testing stations, it’s re-tests. Not because testers don’t know better (most do), but because the pressure of a busy workshop can make a re-test feel like a formality rather than the genuine safety check it is.
This post is here to reset that thinking as MOT re-tests done right will help to ensure you remain DVSA compliant.
A re-test isn’t a tick-box exercise. Done poorly, it’s a regulatory risk that could cost you your tester status, drag your site manager into an investigation and, most importantly, put a vehicle back on the road that shouldn’t be there.
Let’s talk about what good looks like, starting with the one area we’re seeing the most cause for concern right now: brake-related failures and the roller brake test.
Why Brake Failures Demand More, Not Less
When a vehicle fails its MOT on a brake-related defect (whether that’s inefficient braking, imbalanced brake performance, seized callipers, worn discs or pads) the re-test must include a roller brake test. No exceptions and definitely no shortcuts.
A roller brake test is not optional following a brake failure. If brakes caused the initial failure, the RBT must be carried out as part of the re-test. This is non-negotiable under MOT Guide section B.5.
Yet we’re seeing re-tests where the roller brake test simply isn’t happening.
The repair may be perfect and the tech may be excellent. You might have every confidence the vehicle is now safe but your confidence alone isn’t the standard.
The standard is a documented, properly conducted roller brake test with results recorded, every single time a brake-related defect is being re-examined.
The Speed Problem: What a 40-Second Re-Test Is Really Telling Us
A properly conducted partial re-test takes time. Not hours, but certainly not seconds either. When we see re-tests that have been completed in just a few minutes, it’s a clear signal that something has been missed. In an investigation, the timestamp will be one of the first things DVSA looks at.
Think about what a re-test genuinely involves:
- Bringing the vehicle to the MOT bay
- Logging the re-test on the MOT testing service
- Physically inspecting all failed defects (dangerous and major)
- Checking anything else that may have been affected by the repair
- Carrying out a roller brake test where brakes were involved and recording the results
- Re-checking headlamp aim where this was part of the original failure
- Reviewing advisory and minor defects to mark as repaired if work has been completed
- Logging off and issuing the correct paperwork
None of that happens in a few seconds. A re-test that completes that quickly hasn’t been done, it’s just been signed off, and there is a very significant difference between the two.
The Three Re-Test Scenarios: What the Rules Actually Say
The VT9a and MOT Guide are clear on when and how re-tests apply. Let’s walk through the three key scenarios you’ll encounter:
You can read the full official MOT Guide (Section B.5) at gov.uk/guidance/mot-testing-guide/b-authorised-examiners.
Scenario 1: Vehicle Returns Before the End of the Next Working Day (On VT9a List Only)
If the vehicle is taken away for repair and returned before the end of the next working day, and the failure is one of the items listed on the VT9a, a partial re-examination applies with no fee charged.
The VT9a list covers items such as:
- Lamps (excluding headlamp aim)
- Windscreen and glass
- Windscreen wipers and washers
- Tyres and wheels (excluding Classes 1 & 2)
- Seat belts (but not anchorages)
- Registration plates
- Mirrors
- Horn
- Electrical wiring
- Doors, hinges, catches and pillars
- Fuel filler cap
- Steering wheel, among others
Note: brake-related defects are not on this list. A brake failure means Scenario 2 or 3 applies, and the roller brake test is required regardless.
Scenario 2: Vehicle Is Repaired On-Site and Re-Tested Within 10 Working Days
Where the repair is carried out on-site, even if it’s done by the tester themselves, a partial re-examination applies with no fee, provided it’s completed within 10 working days of the original test.
Even if you personally did the repair, you still cannot simply log on and delete defects. The vehicle must come to the bay, the re-test must be conducted in full, and the RBT carried out where applicable.
Scenario 3: Vehicle Is Taken Away and Returns Within 10 Working Days
If the vehicle goes away for repair and returns within 10 working days, a partial re-examination applies, and a partial re-test fee may be charged. The full re-test procedure still applies, including the roller brake test where brake defects were involved.
Remember: only one partial re-test is permitted per full MOT. If a second visit is needed, it becomes a full MOT.
Real-World Re-Test Scenarios: Getting It Right
Scenario A: Failed on Brake Imbalance and Two Worn Tyres
The vehicle goes to a local tyre fitter for the tyres and is repaired in the workshop for the braking issue. It returns the same afternoon.
The correct re-test must include:
- Bringing the vehicle to the bay and logging the re-test
- Visual inspection of both new tyres – correct size, load rating, and condition
- A full roller brake test with results recorded – this is mandatory as a brake defect was involved
- Logging off and issuing the paperwork correctly
Scenario B: Failed on Headlamp Aim and an Exhaust Leak
Both repaired on-site by the workshop technician (not the MOT tester). The tester watched the work being done.
The correct re-test must include:
- Vehicle to the bay, re-test logged
- Check of the exhaust repair (visual inspection and emissions test where applicable)
- Headlamp aim check – this must be carried out again as it was part of the original failure
- Logged off properly with paperwork issued
Scenario C: Failed on All Four Tyres
Customer took the vehicle straight to a national tyre centre and returned within the hour.
The correct re-test must include:
- Vehicle to the bay, re-test logged
- Proper inspection of all four tyres (not just a glance from a distance). Size, load index, speed rating, tread depth, condition including sidewalls
- Logged off and paperwork issued
Even if the customer is waiting and the tyre centre is one you know and trust. The inspection must still happen every time.
What DVSA Are Looking For
DVSA’s approach to monitoring has become increasingly data-driven. Short re-test durations, patterns of re-tests completed outside bay hours, and missing RBT results where brake defects were recorded are all flags that can trigger closer attention.
An investigation following a poorly conducted re-test isn’t just uncomfortable, it puts your tester status, your site manager’s position, and your station’s authorisation at genuine risk. Most investigations that stem from re-test issues weren’t the result of deliberate dishonesty. They were the result of pressure, habit, and the gradual erosion of standards that happens when “quick ones” become normal.
The MOT testing system exists to protect road users. Every re-test is a checkpoint between a failure and a pass certificate. Take that responsibility seriously, and the process protects everyone — including you.
A Quick Reference: MOT Re-Test Requirements at a Glance
| Re-Test Type | Key Requirements |
| Brake-related failure (any scenario) | Roller brake test MUST be carried out and results recorded. Non-negotiable. |
| Headlamp aim failure | Headlamp aim check must be repeated during re-test. |
| Any failed defect | Physical inspection of all failed items required. No skipping, no assumptions. |
| Items affected by repair | Must also be checked, even if not originally listed as a failure. |
| Advisories / minors | Review and mark as repaired if work has been carried out. |
| Re-test timing | Must be properly logged in and out – timestamps matter. |
| Maximum re-tests | One partial re-test per full MOT only. |
The Standard We Should All Be Proud Of
It’s easy to talk about re-tests as an administrative burden but the testers we most admire in this industry are the ones who approach every re-test with the same care they bring to a full MOT. Not because DVSA might be watching but because it’s the right thing to do.
Your pass certificate carries real weight. It tells a customer, a family, a road user that a trained professional has verified this vehicle is safe. That doesn’t stop being true just because it’s a re-test.
So the next time a re-test comes in and someone suggests you “just sign it off”, be the person in the room who knows better. Bring the car to the bay, do the roller brake test, check the headlamps, inspect the tyres properly.
Do it right.
That’s not just compliance, it’s professionalism.
Need support ensuring your team is carrying out re-tests correctly? Whether it’s refresher training, compliance support, or a site review, we’re here to help. Get in touch with The MOT Group today.