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Code of Federal Regulations (Last Updated: May 6, 2024) |
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Title 49 - Transportation |
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Subtitle B - Other Regulations Relating to Transportation |
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Chapter V - National Highway Traffic Safety Administration, Department of Transportation |
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Part 570 - Vehicle in Use Inspection Standards |
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Subpart B - Vehicles With GVWR of More Than 10,000 Pounds |
§ 570.54 - Definitions.
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§ 570.54 Definitions.
Unless otherwise indicated, all terms used in this part that are defined in part 571 of this chapter, Motor Vehicle Safety Standards, are used as defined in that part.
Air-over-hydraulic brake subsystem means a subsystem of the air brake that uses compressed air to transmit a force from the driver control to a hydraulic brake system to actuate the service brakes.
Electric brake system means a system that uses electric current to actuate the service brake.
Vacuum brake system means a system that uses a vacuum and atmospheric pressure for transmitting a force from the driver control to the service brake, but does not include a system that uses vacuum only to assist the driver in applying muscular force to hydraulic or mechanical components.