Section 26506 Of Article 3. Airbrakes From California Vehicle Code >> Division 12. >> Chapter 3. >> Article 3.
26506
. (a) Every motor vehicle airbrake system used to operate the
brakes on a motor vehicle or on a towed vehicle shall be equipped
with a low air pressure warning device that complies with either the
requirements set forth in the Federal Motor Vehicle Safety Standards
in effect at the time of manufacture or the requirements of
subdivision (b).
(b) The device shall be readily visible or audible to the driver
and shall give a satisfactory continuous warning when the air supply
pressure drops below a fixed pressure, which shall be not more than
75 pounds per square inch nor less than 55 pounds per square inch
with the engine running. A gauge indicating pressure shall not
satisfy this requirement.