Brake Testing Reviews

A brake test is one of the few maintenance records a DVSA examiner, auditor or Traffic Commissioner will read line by line. It is not a tick-box for the MOT. It is the single clearest piece of evidence that vehicles in your fleet stop the way the law requires, on the day they were checked, in a state that reflects real operating use. A brake testing review looks at how often you test, how you test, what the results show, and whether the file you hold would satisfy scrutiny.

Operator Licence Ltd reviews brake testing regimes for HGV and PSV operators across the UK, covering single vehicle fleets, mixed depots and national operations. The aim is plain: confirm that the brake performance evidence on file would hold up under inspection, and fix it where it would not.

Why brake testing sits at the centre of operator licence compliance

Brake performance is part of the undertakings on every operator licence. The Guide to Maintaining Roadworthiness expects a calibrated roller brake test at every safety inspection, with a minimum of four laden brake performance assessments per vehicle per year. That figure is a floor, not a target. Operators running high mileage, tipper, tanker or PSV work usually need more frequent checks to catch wear before it shows up at an annual test.

DVSA looks for three things when they review a brake testing file:

• The test was done at a sensible interval, not bunched at MOT time.
• The test reflects real operating conditions, which usually means laden.
• The result, the printout and the follow-up action all match each other and match the PMI sheet.

If any of those three is missing, the file weakens. If all three are missing, the file is the problem.

Roller brake test, decelerometer and road test

A roller brake tester is the primary method. It measures service brake, secondary brake and parking brake efficiency, and it reports imbalance across each axle. The headline figures most operators should know:

• Service brake efficiency: minimum 50% for HGV, 50% for PSV.
• Secondary brake efficiency: minimum 25% for HGV and PSV.
• Parking brake efficiency: minimum 16% for HGV, 18% for PSV.
• Brake imbalance on any axle: not more than 30%.

A decelerometer or Tapley meter is allowed where a roller brake test is not practical, for example for some specialist vehicles or trailers that cannot be presented to a roller. It is a measurement of last resort, not a preference. If a fleet relies on decelerometer readings every cycle, that pattern alone invites questions about why a roller is not being used.

A road test is not a substitute for either. It can support a roller brake test result but cannot replace one in the record.

Laden versus unladen, and what counts as a load

A brake tester running an empty rigid will return numbers that look fine and tell you very little. The DVSA expectation is that brake tests reflect the way the vehicle is used. In practical terms that usually means at least 65% of design axle weights on the day, not a couple of pallets thrown in for the visit.

A brake testing review will examine:

• Whether laden tests are being achieved consistently across the year.
• Whether the load distribution matches operational use.
• Whether unladen tests are being recorded as laden, which is a serious file integrity issue.
• Whether trailers are being tested separately and meaningfully.

Operators sometimes argue that laden tests are difficult to arrange. That argument does not survive a public inquiry. The Senior Traffic Commissioner has been clear that operators are expected to plan for laden testing, not avoid it.

Brake performance trends and how a file goes wrong

A single pass result tells you one day. A brake testing review reads the file across twelve months. The pattern is where risk lives. Service brake efficiency drifting from 65% down to 52% over four inspections is still legal at every point and still a warning that components are approaching end of life. Imbalance creeping from 12% to 26% on a steer axle is the same story.

Common findings during a review:

• Printouts filed without comparison to previous results.
• Defects identified at brake test but not closed out on the rectification sheet.
• Gaps of more than 13 weeks between laden tests.
• PMI dates that do not align with brake test dates on the same vehicle.
• Brake test data missing for trailers, even where the unit is tested.
• Decelerometer being used routinely without justification on file.

Each of these is fixable. Left in place across a fleet, they form the picture an examiner uses to decide whether the operator has effective control.

When I review a brake testing file the first thing I do is line up the roller brake test printouts with the PMI sheets and the driver defect reports for the same week. If those three do not tell the same story, that is the gap a Traffic Commissioner will press on. A clean printout is no use if the defect it reveals is never written up, never actioned and never signed off.

Liam Gafoor CMILT IOSH, transport compliance adviser

What a brake testing review covers

A review from Operator Licence Ltd looks at the full evidence chain, not just the most recent printout. We work through:

• Twelve months of brake test records per vehicle and per trailer.
• Alignment between roller brake test, PMI and driver defect reports.
• Laden status and load evidence.
• Imbalance, efficiency and any axle showing repeat issues.
• Calibration records of the roller brake tester used.
• Rectification of any defects raised at test, with sign-off and date.
• The operator’s written maintenance system reference to brake testing frequency and method.
• The transport manager’s oversight evidence of brake performance trends.

You receive a written report identifying which records are audit-ready, which are weak, and which need rebuilding before any DVSA visit, audit, application variation or public inquiry.

When to commission a brake testing review

Common triggers include an upcoming DVSA maintenance investigation or follow-up visit, a notice to attend a public inquiry or preliminary hearing, a new transport manager taking over the file, preparation for an external audit such as FORS or DVSA Earned Recognition, a recent MOT failure on brake performance, an OCRS score moving the wrong way, or a variation application to add vehicles or a new operating centre.

Operators who wait until DVSA arrives have already lost the chance to fix the file in advance. A review done in calm conditions, six to twelve weeks before any event, gives time to rebuild the evidence properly.

Operator Licence Ltd can review your brake testing evidence, identify the gaps in laden testing, PMI alignment and rectification follow-up, and connect you with the right specialist support to bring the file up to the standard DVSA and the Traffic Commissioner expect.

Request a brake testing review