['CMV Parts and Maintenance']
['Brakes']
01/03/2025
...
Interpretations to Part 393 — Parts and accessories necessary for safe operation
Question 1: May the ‘‘park’’ position of a CMV’s transmission be used as a parking brake to comply with the §393.41?
Guidance: No. The ‘‘park’’ position of the transmission is only a locking device used to lock the transmission.
Question 2: Does §393.41 prohibit air brake systems from being equipped with a means to release the spring brakes for purposes of towing disabled vehicles in emergency situations?
Guidance: No, provided the brakes are designed and maintained so they cannot be released unless adequate energy is available to make immediate reapplication of the brakes when the brake system is operable.
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