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S.B. 302
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VETOES
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the individual vehicles are designed to be operated by a single control on the towing
vehicle, nor does it apply to the operation of electric trailer brakes.
(j) (1) Air Brakes. Every bus, truck, or truck tractor with air operated
brakes shall be equipped with at least one reservoir sufficient to insure that, when
fully charged to the maximum pressure as regulated by the air compressor governor
cut-out setting, a full service brake application may be made without lowering the
reservoir pressure by more than 20 percent. Each reservoir shall be provided with
means for readily draining accumulated oil or water.
(2) Vacuum Brakes. After June 1, 1971, every truck with three or more
axles equipped with vacuum assistor type brakes and every truck tractor and truck
used for towing a vehicle equipped with vacuum brakes shall be equipped with a
reserve capacity or a vacuum reservoir sufficient to insure that, with the reserve
capacity or reservoir fully charged and with the engine stopped, a full service brake
application may be made without depleting the vacuum supply by more than 40
percent.
(3) Reservoir Safeguarded. All motor vehicles, trailers, semitrailers, and
pole trailers, when equipped with air or vacuum reservoirs or reserve capacity as
required by this section, shall have reservoirs or reserve capacity so safeguarded by a
check valve or equivalent device that, in the event of failure or leakage in its
connection to the source of compressed air or vacuum, the stored air or vacuum is not
depleted by the leak or failure.
(k) (1) Air Brakes. Every bus, truck, or truck tractor using compressed air
for the operation of its own brakes or the brakes on any towed vehicle, shall be
provided with a warning signal, other than a pressure gauge, readily audible or
visible to the driver, which will operate at any time that the air reservoir pressure of
the vehicle is below 50 percent of the air compressor governor cut-out pressure. In
addition, the vehicle shall be equipped with a pressure gauge visible to the driver,
which indicates in pounds per square inch the pressure available for braking.
(2) Vacuum Brakes. After June 1, 1971, every truck tractor and truck
used for towing a vehicle equipped with vacuum operated brakes and every truck with
three or more axles using vacuum in the operation of its brakes, except those in
driveaway or towaway operations, shall be equipped with a warning signal, other
than a gauge indicating vacuum, readily audible or visible to the driver, which will
operate at any time the vacuum in the vehicle's supply reservoir or reserve capacity is
less than 8 inches of mercury.
(3) Combination of Warning Devices. When a vehicle required to be
equipped with a warning device is equipped with both air and vacuum power for the
operation of its own brakes or the brakes on a towed vehicle, the warning devices may
be, but are not required to be, combined into a single device that serves both purposes.
A gauge or gauges indicating pressure or vacuum is not an adequate means of
satisfying this requirement.
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- 4518 -
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