Testing a vehicle’s braking performance is an important road safety aspect of the annual test and periodic maintenance inspections. As part of a Heavy Goods Vehicles (HGV – motor vehicles & trailers) annual test, DVSA carries out a roller brake test according to the ISO brake testing standard (21069).
full story can be read @ Bring your heavy goods vehicle to annual test (MOT) appropriately laden – Moving On (blog.gov.uk)