Swiss Category C Theory (Truck) Practice Questions - Switzerland Driving Theory Test - Category C (Heavy Motor Vehicles) Exam

What is the purpose of the Red (Supply) and Yellow (Service) pneumatic coupling lines between a truck and a trailer?

Red line = service-brake control; Yellow line = continuous reservoir supply Both lines supply reservoir pressure; the electrical connector alone controls service braking Red line = pneumatic parking-brake release only; Yellow line = trailer suspension supply only Red line = continuous supply line charging the trailer reservoirs and supporting emergency action; Yellow line = service-brake control line whose pressure follows the braking command

Correct Answer:

Red line = continuous supply line charging the trailer reservoirs and supporting emergency action; Yellow line = service-brake control line whose pressure follows the braking command

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