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PARRIS N. GLENDENING, Governor
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S.B. 302
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June 1, 1970, shall be equipped with brakes acting on all wheels and of a character to
be applied automatically and promptly, and remain applied for at least 15 minutes on
breakaway from the towing vehicle.
(2) Every trailer, semitrailer, and pole trailer with a registered gross
weight of more than 3,000 pounds and not more than 10,000 pounds, manufactured or
assembled after June 1, 1970, shall be equipped with brakes acting on all wheels of at
least 1 axle and of a character to be applied automatically and promptly, and remain
applied for at least 15 minutes on breakaway from the towing vehicle.
(f) Every motor vehicle manufactured or assembled after June 1, 1970, and
used to tow a trailer, semitrailer, or pole trailer equipped with brakes, shall be
equipped with means for providing that, in case of breakaway of the towed vehicle,
the towing vehicle will be capable of being stopped by the use of its service brakes.
(g) Air brake systems installed on trailers manufactured or assembled after
June 1, 1970, shall be so designed that the supply reservoir used to provide air for the
brakes is safeguarded against backflow of air from the reservoir through the supply
line.
(h) (1) Air Brakes. After June 1, 1971, every towing vehicle, when used to
tow another vehicle equipped with air controlled brakes, in other than driveaway or
towaway operations, shall be equipped with two means for emergency application of
the trailer brakes, One of these means shall apply the brakes automatically in the
event of a reduction of the towing vehicle air supply to a fixed pressure, which shall be
not lower than 20 pounds per square inch nor higher than 45 pounds per square inch.
The other means shall be a manually controlled device for applying and releasing the
brakes, readily operable by a person seated in the driving seat, and its emergency
position or method of operation shall be clearly indicated. In no instance may the
manual arrangement be arranged to permit its use to prevent operation of the
automatic means. The automatic and the manual means required by this section may
be, but are not required to be, separate.
(2) Vacuum Brakes. After June 1, 1970, every towing vehicle used to tow
other vehicles equipped with vacuum brakes, in operations other than driveaway or
towaway operations, shall have, in addition to the single control device required by
subsection (i) of this section, a second control device that can be used to operate the
brakes on towed vehicles in emergencies. The second control shall be independent of
brake air, hydraulic, and other pressure, and independent of other controls, unless the
braking system is so arranged that failure of the pressure on which the second control
depends will cause the towed vehicle brakes to be applied automatically, The second
control is not required to provide modulated braking.
(i) [After] EXCEPT AS PROVIDED IN SUBSECTION (L) OF THIS SECTION,
AFTER June 1, 1971, every motor vehicle, trailer, semitrailer, and pole trailer, and
every combination of these vehicles, except motorcycles, equipped with brakes shall
have the braking system so arranged that one control device can be used to operate all
service brakes. This requirement does not prohibit vehicles from being equipped with
an additional control device to be used to operate brakes on the towed vehicles. This
regulation does not apply to driveaway or towaway operations unless the brakes on
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- 4517 -
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