What is the minimum compressed air reservoir volume dedicated to the air brakes required by an FMVSS-121 compliant highway trailer?

Question

Quizplus · Accepted Answer

The Federal Motor Vehicle Safety Standards (FMVSS-121) require that the minimum compressed air reservoir volume dedicated to the air brakes for a highway trailer must be at least 12 times the total brake chamber volume. However, the correct choice for the minimum requirement as per the options provided is 8 times total brake chamber volume, indicating a discrepancy in the options. The actual FMVSS-121 standard specifies a detailed calculation for reservoir size based on brake chamber volume and other factors, but the simplified requirement often cited for general knowledge is 12 times the total brake chamber volume. The choice provided here (B) is incorrect based on the standard's detailed requirements but is the closest to the standard's intent among the given options.

What Is the Minimum Compressed Air Reservoir Volume Dedicated to the Air