S.C. Code Regs. 38-393.46. Brake tubing and hose connections

All connections for air, vacuum, or hydraulic braking systems shall: (a) Be adequate in material and construction to insure proper continued functioning; (b) Be designed, constructed, and installed so as to insure, when properly connected, an attachment free of leaks, constrictions, or other defects; (c) Have suitable provision in every detachable connection to afford reasonable assurance against accidental disconnection; (d) Have the vacuum brake engine manifold connection at least three eighths inch in diameter. (e) If installed on a vehicle on or after January 1, 1981, meet requirements under applicable subsections of FMVSS 106 (49 CFR 571.106). (f) Splices in tubing if installed on a vehicle after March 7, 1989, must use fittings that meet the requirements of SAE Standard J512 OCT 80 Automotive Tube Fittings or for air brake systems SAE J246 March 81 Spherical and Flanged Sleeve (Compression) Tube Fittings as found in the SAE Handbook 1985 edition.