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In an FMVSS121 compliant air brake system, cut out pressure is between 115 - 130 psi, with a cut-in pressure of no more than 25 psi below cut-out pressure. The 90 psi figure is what the brake chambers are regulated at, not the entire system.

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8y ago

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Most are regulated to 90 psi.

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13y ago
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Q: What is normal air pressure for an air brake system?
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