Heavy Goods Vehicles (HGV), Public service Vehicles (PSV) and heavy trailers require a Roller Brake Test during their Statutory Test (MOT).
The computer controlled Roller Brake Tester (RBT) knows how to test the individual vehicles/trailers because a brake code or DTP number is entered.
The DTP number contains all the information for the vehicle being tested, for example:
Axle weights
Design Gross Vehicle and Train weights
Make,
Age,
etc .
This spreadsheet gives all the information that sits behind DTP numbers allocated to HGV only (PSV and Trailers are different).
Some DTP numbers have prefixes and suffixes, when using the DTP number, put it into the roller brake tester as it appears on the vehicle plating certificate.
Normally the prefixes are displayed and used, the suffixes however will prompt the computer to ask for the location of park brakes.
For PSV brake codes, please go to:
https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fassets.publishing.service.gov.uk%2Fmedia%2F5dfa046040f0b6093fe76083%2Fwork-out-psv-brake-code.xlsx&wdOrigin=BROWSELINK
(the excel worksheet may need to be opened in desktop app to work correctly)
Note: The information entered into this spreadsheet may be slightly different to that given to the DVSA when the PSV was entered into service - therefore the code may be slightly different to that used at MOT. Best practice would be to take note of the code from the MOT brake printout.
This spreadsheet was last updated November 2025