Air-brake systems usually have two lines. Which additional line is fitted on a three-line system?
Explanation
"The blue (auxiliary) line isn't used when connecting to a two-line system. Follow the manufacturer's instructions about what to do with this third line."
Driving Theory Test is the online platform for UK drivers that want to study and pass the UK theory test on their first try. The system is designed to teach you the study material interactively. Plus, our practice questions cover all sections of the Highway Code. So, you have a comprehensive review of all the need-to-know information to sit the DVSA theory test.