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Ask ten transport managers whether their vehicles need a laden roller brake test and you are likely to get ten different answers. Brake testing is arguably the most misunderstood element of commercial vehicle compliance, and that confusion carries very real consequences. Traffic Commissioners and DVSA enforcement officers know it, which is exactly why it has become a priority area for scrutiny.
This article cuts through the noise. We will explain what the current regulations require, what changed from April 2025, and why the belief that certain vehicles are simply “exempt” from laden testing is one of the most dangerous assumptions in fleet management.
Brake failure or poor brake performance is a leading cause of serious commercial vehicle incidents on UK roads. The DVSA has long recognised that many braking defects simply do not show up when a vehicle is tested empty. A trailer running unladen can appear to pass with flying colours and then perform dangerously when loaded to its operational weight. This is why the regulator has steadily tightened its stance on laden testing.
The Guide to Maintaining Roadworthiness is the DVSA’s primary tool for assessing whether an operator is fulfilling their O-licence obligations. While not every element of the guide is enshrined directly in legislation, its guidance should be treated as a requirement by all operators. Falling short of what the guide expects is a fast route to a public inquiry.
Following significant updates that came into force in April 2025, the DVSA’s Guide to Maintaining Roadworthiness now requires the following for HGVs and trailers.
Every vehicle and trailer must have its braking performance assessed at least four times per year, spread evenly across the maintenance cycle. One of those assessments must take place at the annual MOT. What changed from April 2025 is the expectation that each safety inspection includes a measured brake performance test, not just the annual test.
Unless a vehicle qualifies for a genuine exemption, every roller brake test must be conducted with the vehicle loaded to at least 65% of its maximum design axle weight. An unladen test on a vehicle that routinely operates fully loaded is not a meaningful test. The DVSA is clear on this, and Traffic Commissioners have questioned operators directly on this point at public inquiries.
For a vehicle to pass a roller brake test, it must achieve:
A laden roller brake test is the preferred method, but it is not the only one accepted. Operators have three options, though they are not equal.
The RBT remains the industry standard and the method the DVSA considers most reliable. The vehicle’s wheels are placed on driven rollers, and braking force is measured per axle when the brakes are applied. A calibrated, well-maintained RBT operated by a competent person gives operators the clearest picture of actual braking performance.
An EBPMS monitors braking performance continuously during a vehicle’s normal operation. Where sufficient braking events have been recorded across the period between safety inspections, an EBPMS report can replace a laden RBT for that inspection cycle.
However, there are important conditions attached. The EBPMS data must be evaluated and signed off before every safety inspection by a competent person who can properly interpret the outputs. The operator, not the employee, retains responsibility for ensuring that competence. An RBT must still be carried out at the annual MOT; EBPMS cannot replace it entirely.
A further practical limitation is that EBPMS relies on sufficient braking events being recorded. Infrequently used vehicles may not generate enough data, making this option unsuitable for parts of some fleets.
A decelerometer measures the rate at which a vehicle slows when the brakes are applied. The DVSA accepts this method only as a last resort, in situations where the type or construction of a vehicle makes RBT testing physically impossible. A decelerometer test is only valid if accompanied by temperature readings. Operators should not treat this as a routine alternative.
From 21 August 2025, the DVSA introduced an additional option for annual testing. Load simulation brake rollers can now be used during HGV and trailer annual MOT tests, meaning vehicles may no longer need to be physically laden before being presented for their annual test where approved simulation equipment is available.
This is a welcome development for operators where loading vehicles purely for testing purposes is logistically difficult or expensive. It does not change the underlying requirement to carry out four brake performance assessments per year, and vehicles that were already exempt from laden testing continue to be so.
This is where a great deal of confusion and non-compliance originates. Many operators believe that because their vehicle type appears on a list of potential exemptions, they are free to skip laden testing entirely. That is not how the exemptions work.
The DVSA provides examples of vehicle types where laden testing may not be practicable. These include:
The critical point is that this list is not exhaustive, and the examples are just that: examples. An exemption from laden testing is not an exemption from brake testing.
Every safety inspection must still include a braking performance assessment. Where a laden RBT is not being carried out, the operator must have a fully documented risk assessment on file. That risk assessment must be reviewed against every safety inspection to confirm it remains relevant, formally reviewed at least every 12 months or whenever the vehicle’s use changes, and retained with the vehicle’s maintenance records for a minimum of 15 months.
Where a vehicle genuinely cannot be laden for testing, four unladen RBTs per year remain the minimum, unless the construction or weight of the vehicle makes even unladen RBT physically impossible. If unladen RBT is not possible, data from an EBPMS or a decelerometer with temperature readings must be used.
There is no scenario in which a vehicle simply has no braking performance assessment carried out. The question is always which method is being used, and whether the evidence on file supports the choice made.
If a laden RBT is not being completed at every safety inspection, a risk assessment must justify that decision. The DVSA expects the risk assessment to document factors including:
If this documentation does not exist, or does not withstand scrutiny, the Traffic Commissioner will take a dim view. Public inquiry outcomes in this area have made it abundantly clear that operators cannot simply point to a vehicle type and claim exemption without supporting evidence. If you are unsure whether your current records would stand up, a Maintenance System Paperwork Audit will identify any gaps before the DVSA does.
When DVSA enforcement officers or Traffic Commissioners examine brake testing compliance, they are not only checking whether tests have been done. They want to see evidence of a proactive system.
That means brake test reports retained and accessible, results that are being analysed and acted upon, maintenance providers that have been audited and confirmed as competent, and decision-making around exemptions that is documented and defensible. Operators who can demonstrate all of this are in a strong position. Those who cannot face serious consequences, including curtailment, suspension or revocation of their operator licence.
It is worth noting that relying on a main dealer or third-party maintenance provider does not transfer responsibility. The operator remains accountable. That includes verifying that the maintenance facility holds an appropriate standard of competence. IRTEC accreditation is the recognised industry benchmark for technician competence in commercial vehicle inspection and maintenance, and it is increasingly referenced by DVSA as evidence that your workshop team is properly qualified.
Operators pursuing or already enrolled in the DVSA Earned Recognition scheme should pay particular attention. Brake testing compliance is one of the standards audited as part of the scheme, and an inconsistent approach will undermine your application.
If you are responsible for fleet compliance, there are several immediate actions worth reviewing:
Brake testing compliance is not an optional extra. It is one of the clearest indicators to the DVSA and Traffic Commissioners of how seriously an operator takes roadworthiness. Getting this right protects your drivers, other road users, and your business.
Lloyd Morgan Group provides transport compliance support, operator licence training, and fleet management services to operators across the UK. For guidance on your brake testing policy or a review of your maintenance systems, contact our team or call 01543 897505.
Email us at:
info@lloydmorgangroup.co.uk
Find us at:
Lloyd Morgan Group Ltd
Phoenix House,
Hemlock Park,
Hyssop Close,
Cannock.
WS11 7GA
