Just my View.
I the Airport Crashtender Industry. vehicles are required to meet braking requirements, These vehicles
are permanent 4x4, 6x6, and 8x8 drive. as we well know it is not possible for these type of vehicles to be tested on brake rollers but never the less the vehicles still have to meet brake requirements.
For the airport crash tenders they have to comply to NFPA and ICAL regs. In order to obtain the brake % for the customer we use a digital brake meter. eg.http://www.wagerusa.com/media/brakemeters/brakecheck_leaflet.pdf
These are MOT appoved, and you can print out the test results.This is how the current BR90 bridging vehicles the MOD have where tested, due to the permanent 8x8 drive and tyres.
The big problem is that all the MOT test Stations have there own view and interpritation on the regs.
Clive
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protruckservices.com