[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR393.49]

[Page 1068]
 
                        TITLE 49--TRANSPORTATION
 
        CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION,
                      DEPARTMENT OF TRANSPORTATION
 
PART 393--PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents
 
                            Subpart C--Brakes
 
Sec. 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 
Sec. 393.44. This section shall not be applicable to driveaway-towaway 
operations unless the brakes on such operations are designed to be 
operated by a single valve.