Section 308.07. Warning devices and gauges.

 

(1)   Air brakes as provided in sub. (4). Every truck and truck tractor using compressed air for the operation of its own brakes or the brakes of any towed vehicle shall be equipped with a warning signal readily audible or visible to the driver, which will give continuous warning at all pressures below a fixed pressure not less than one-half of the compressor governor cut-out pressure. In addition, each such vehicle shall be equipped with a pressure gauge which will indicate to the driver the pressure in pounds per square inch available for braking.

(2)   Vacuum brakes as provided in sub. (4). Every truck and truck tractor using vacuum for the operation of its own brakes and vacuum for the brakes on any towed vehicle shall be equipped with a warning signal readily audible or visible to the driver, which will give continuous warning at any time the vacuum in the vehicle's supply reservoir is less than 8 inches of mercury. In addition, each such vehicle shall be equipped with a vacuum gauge which will indicate to the driver the vacuum in inches of mercury available for braking.

(3)   Maintenance. The warning devices and gauges required by this section shall be maintained in operative condition.

(4)   Application. This section applies to all combinations of property-carrying vehicles utilizing trailers or semi-trailers where the gross weight of the trailer or semi-trailer is 3000 pounds or more.

History: Cr. Register, July, 1968, No. 151 , eff. 8-1-68; renum. from MVD 8.07, Register, September, 1980, No. 297 , eff. 10-1-80.