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Which of the following pressure values are FMVSS-121 compliant for governor cut-out and cut-in pressures?a.cut-out at 115 psi and cut-in at 85 psib.cut-out at 135 psi and cut-in at 90 psic.cut-out at 110 psi and cut-in at 80 psid.cut-out at 135 psi and cut-in at 115 psia.What values MUST governor cutout p

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The pressure values of FMVSS-121 compliant for governor cut-out and cut-in pressures is cut-out at 135 psi and cut-in at 115 psi.

The air compressor systems and reservoirs on trucks, buses, and trailers must comply with a number of standards in FMVSS No. 121. FMVSS No. 121 specifies the minimum capacity of the reservoirs to ensure that there is a sufficient reserve of air to repeatedly apply the brakes without causing an excessive loss of system air pressure. According to S5.1.2.1, for trucks and buses, the overall reservoir volume (combined volume of main, secondary, and supply reservoirs) must be at least 12 times the total volume of all of the vehicle's service brake chambers. To allow vehicle manufacturers to install long-stroke brake chambers in place of standard-stroke brake chambers without having to enlarge the reservoirs, slight exceptions are provided in Brake Chamber Rated Volumes.

Learn more about FMVSS No. 121, here

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