Correct answer
To immobilise the vehicle when parking.
Keep the vehicle stationary when parked. Apply it according to manufacturer instructions and take other necessary securing measures. Actuation may be manual or electric and configuration varies; do not assume it always acts on rear wheels. The service brake normally reduces speed while driving.
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To reduce the vehicle's speed in town.
To reduce the vehicle's speed when travelling on a road with a long gradient.
To immobilise the vehicle when parking.
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