7 step air brake test
49 CFR § 571.121 - Standard No. 121; Air brake systems.
This standard establishes performance and equipment requirements for braking systems on vehicles equipped with air brake systems. S2. Purpose.
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Air brake (road vehicle) - Wikipedia
An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used ...
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Section 5: Air Brakes - California DMV
You should use the basic 7-step inspection procedure described in Section 2 to inspect your vehicle. There is more to inspect on a vehicle with air brakes ...
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