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Ch. 14
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1114
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LAWS OF MARYLAND
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GROSS WEIGHT IN EXCESS OF 3,000 POUNDS, MANUFACTURED OF
ASSEMBLED AFTER 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.
(F) TRACTOR BRAKES PROTECTED.
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) TRAILER AIR RESERVOIRS SAFEGUARDED.
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) TWO MEANS OF EMERGENCY BRAKE OPERATION.
(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
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