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2024 MS CDL Practice Test: Class A - Test 6

3. In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
A
50 to 80 psi.
B
10 to 20 psi.
C
10 to 30 psi.
D
20 to 45 psi.
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Class A - Test 6
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