§393.40 Required Brake Systems

Question 1: May a system such as "driveline brakes" be used as an emergency brake provided it complies with the requirements of §393.52?

Guidance: Yes. CMVs which were not subject to the emergency brake requirements of FMVSS Nos. 105 or 121 may use "driveline brakes" provided those vehicles meet the requirements of §393.52.