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Air-brake systems usually have two lines. Which additional line is fitted on a three-line system?

Question Topic: Braking Systems
Saved Questions | Completed Questions Incomplete Questions Question Topic: Braking Systems
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Service
Electrical
Emergency
Auxiliary
← The emergency line is common to both two-line and three-line brake systems. What colour is it? In frosty weather, what precaution could a lorry driver take to prevent moisture from freezing in the air-brake system? →

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