Discussion
Which brake type is common on heavy commercial vehicles?
Answer: D
Compressed air gives the force needed for a heavy vehicle and permits a trailer to be braked through simple couplings. Air disc brakes have largely replaced drums on new vehicles. The system fails safe through spring brakes. The shared behaviour explains why these belong together and the differences explain why both exist. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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