What each standard or directive actually requires, where it stops, and what it means for the equipment you specify. Written against the documents themselves rather than against a brochure.
ISO 21069 is the reason two inspection stations can be expected to return the same braking figure for the same truck. It does not set a pass mark. It sets the test method, the conditions under which the test is valid, and the data the instrument has to produce.
Read moreR13 and R13-H approve the braking system of a vehicle type. They do not approve a brake tester and they do not set the inspection procedure for a vehicle already on the road. Buyers mix the two constantly, and it leads to equipment specified for a test it will never perform.
Read moreDirective 2014/45/EU harmonised periodic technical inspection across the EU. It sets what has to be inspected, how defects are graded, and how results are recorded. It does not name a single machine — which is why the equipment list is a design decision, not a shopping list.
Read moreGB 7258 is the Chinese mandatory standard for the safety of in-service motor vehicles. Braking is one of the items it governs, and the bench method it relies on is the reason Chinese inspection lanes are built the way they are.
Read moreA brake tester that has drifted is worse than no tester, because it produces confident numbers that cannot be defended. Calibration is the only thing standing between a measurement and a claim.
Read moreOIML R 99 is the reference document behind most national rules for petrol exhaust gas analysers. Since 2008 its technical content has been published jointly with ISO as ISO PAS 3930, so the two numbers describe one set of requirements, not two competing ones.
Read moreISO 11614 is the standard behind the smoke meter on a diesel lane. It defines two different numbers from the same light beam — opacity as a percentage and the light absorption coefficient k — and the difference between them decides whether two stations can compare results at all.
Read moreUN R90 governs replacement brake linings, drums and discs rather than vehicles. It exists because a friction material that behaves differently from the original changes brake balance, and brake balance is what a roller brake tester measures axle by axle.
Read moreUN R51 is a type-approval regulation for the sound a new vehicle type emits, measured by a defined pass-by method. It is regularly confused with the noise check some inspection regimes run, and the confusion leads stations to buy equipment they cannot use.
Read moreISO/IEC 17025 is a standard about laboratories, not about instruments. It is the reason an auditor will accept one calibration certificate for a brake tester and reject another that looks identical on the cover.
Read moreISO/IEC 17020 is the standard an inspection body is assessed against when a regulator, an insurer or a manufacturer wants evidence that its reports mean something. For a vehicle testing station it is the difference between issuing a certificate and issuing an opinion.
Read moreSend the clause the tender references and the vehicle classes it covers. We will tell you which stations satisfy it and which claims in a competing bid do not.