Marvin Mandel, Governor                        1517

(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 res-
ervoir fully charged and with the engine stopped, a full service
brake application may be made without depleting the vacuum supply
by more than 4.0 per cent.

(3)    Reservoir safeguarded. All motor vehicles, trailers, semi-
trailers, and pole trailers, when equipped with air or vacuum reser-
voirs 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 con-
nection to the source of compressed air or vacuum, the stored air or
vacuum shall not be depleted by the leak or failure.

(j) Warning devices.

(1)    Air brakes. Every bus, truck or truck tractor using com-
pressed 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 the air reservoir pressure of the vehicle is below
50 per cent of the air compressor governor cut-out pressure. In addi-
tion, 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 opera-
tions, 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 eight 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 which will serve both purposes. A
gauge or gauges indicating pressure or vacuum shall not be deemed
to be an adequate means of satisfying this requirement.

§ 12-302. Performance ability of brakes.

(a) Every motor vehicle and combination of vehicles at all times
and under all conditions of loading, upon application of the service
brake, shall be capable of:

(1)    Developing a braking force that is not less than the per-
centage of its gross weight tabulated herein for its classification;

(2)    Decelerating to a stop from not more than twenty miles per
hour at not less than the feet per second per second tabulated herein
for its classification; and

(3)    Stopping from a speed of twenty miles per hour
in not more than the distance tabulated herein for its