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# How much is the maximum pressure of air brakes on trucks?

Updated: 4/28/2022

Wiki User

9y ago

An FMVSS 121 compliant air brake system is supposed to be regulated to where the cutoff pressure is between 115 and 135 PSI and the cut-in pressure is no more than 20 psi below the cut-out pressure. The absolute minimum cut-in pressure for buses is 85 psi, and for trucks it's 100 psi.. otherwise, the air governor needs to be replaced.
60 psi is the hold off pressure for a spring brake system, while brake emergency chambers are governed at 90 psi.

Generally adjusted for 125 psi but they also have a blow-off valve that releases anything over 150 psi for safety purposes.

Wiki User

9y ago

Wiki User

9y ago

An FMVSS 121 compliant air brake system is supposed to be regulated to where the cutoff pressure is between 115 and 135 PSI and the cut-in pressure is no more than 20 psi below the cut-out pressure. The absolute minimum cut-in pressure for buses is 85 psi, and for trucks it's 100 psi.. otherwise, the air governor needs to be replaced.
60 psi is the hold off pressure for a spring brake system, while brake emergency chambers are governed at 90 psi.

Wiki User

9y ago

Generally adjusted for 125 psi but they also have a blow-off valve that releases anything over 150 psi for safety purposes.

lilyvargas2649

Lvl 2
2y ago

If part of the cargo is unloaded, the remaining cargo should be moved to

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Q: How much is the maximum pressure of air brakes on trucks?
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