Appendix 3a Goal 1.2 requires knowledge of the limits of service brakes and retarders. What is the professional point?

1. Service brakes may be used continuously on long descents because the retarder is only decorative
2. Retarders replace ABS on ice
3. Each device has a working range; overusing the service brakes on a long descent overheats them, so the driver must combine brakes, retarder and gear correctly
4. Brake limits are tested only on the Ordinance 38 licence paper