Correct answer
Secondary brake.
Secondary braking. For category O2, the table requires service and parking braking; “parking brake and handbrake” are not two different functions. It also specifies automatic braking on separation above 1,500 kg; up to that mass it accepts the secondary coupling specified in the relevant note. Automatic braking following separation is distinct from secondary braking.
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Parking brake.
Service brake.
Secondary brake.
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