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What kind of pressure is developed in a semi truck hydraulic brake system?

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Semi trucks have air brakes, no hydraulics

some very old trucks had air over hydraulic systems but they used no more pressure than any other system

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First answer by ID1074558091. Last edit by Frmtrkr. Contributor trust: 725 [recommend contributor]. Question popularity: 40 [recommend question]

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Brake switch located on a semi truck?