South Carolina Code of Regulations
Chapter 38 - DEPARTMENT OF PUBLIC SAFETY
Article 5 - STATE TRANSPORT POLICE REGULATIONS
Subarticle 1 - UNMANUFACTURED FOREST PRODUCTS TRUCKING REGULATIONS
Part 38-393 - PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION
Subpart C - BRAKES
Section 38-393.49 - Single valve to operate all brakes

Every motor vehicle, the date of manufacture of which is subsequent to June 30, 1953, which is equipped with power brakes, shall have the braking system so arranged that one application valve shall when applied operate all the service brakes on the motor vehicle or combination of motor vehicles. This requirement shall not be construed to prohibit motor vehicles from being equipped with an additional valve to be used to operate the brakes on a trailer or trailers or as provided in Regulation Regulation 38-393.44. 38-393 shall not be applicable to driveaway towaway operations unless the brakes on such operations are designed to be operated by a single valve.