Cal. VEH § 26507
This is the official text of Cal. VEH § 26507, part of California’s Vehicle Code — governs traffic laws, driver's licenses, and vehicle registration.
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Official statutory text
A check valve shall be installed and properly maintained in the air supply piping of every motor vehicle equipped with airbrakes, either between the air compressor and the first reservoir or tank immediately adjacent to the air intake of said reservoir, or between No. 1 reservoir (wet tank) and No. 2 reservoir (dry tank) immediately adjacent to the air intake of the No. 2 reservoir; provided, that the air supply for the brakes is not drawn from the No. 1 reservoir and that the No. 1 and No. 2 reservoirs are connected by only one pipeline.
Status: in_force · Read it on the official government site
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