['CMV Parts and Maintenance']

['Warning devices']

01/03/2025

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§393.51 Warning devices and gauges

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§393.51 Warning devices and gauges

RegSense Fleet Safety Federal Motor Carrier Safety Administration (FMCSA), DOT CMV Parts and Maintenance Warning devices Focus Area Compliance Docs Standard Interpretation English Transportation USA

Interpretations to Part 393 — Parts and accessories necessary for safe operation

Question 1: Is the low pressure warning device required to activate before the tractor protection valve?

Guidance: No. Section 393.51 does not explicitly require the warning device to operate before the protection valve. It is implied that if the operating pressure of the warning device is at least ¹/₂ of the governor cut-out pressure, and that pressure is not less than the pressure at which the protection valve (or similar device) activates, the requirements of §393.51 are satisfied.