[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: 49CFR393.42]

[Page 1064-1065]
 
                        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. 393.42  Brakes required on all wheels.

    (a) Every commercial motor vehicle shall be equipped with brakes 
acting on all wheels.
    (b) Exception. (1) Trucks or truck tractors having three or more 
axles--
    (i) Need not have brakes on the front wheels if the vehicle was 
manufactured before July 25, 1980; or
    (ii) Manufactured between July 24, 1980, and October 27, 1986, must 
be retrofitted to meet the requirements of this section within one year 
from February 26, 1987, if the brake components have been removed.
    (2) Any motor vehicle being towed in a driveaway-towaway operation 
must have operative brakes as may be necessary to ensure compliance with 
the performance requirements of Sec. 393.52. This paragraph is not 
applicable to any motor vehicle towed by means of a tow-bar when any 
other vehicle is full-mounted on such towed motor vehicle or any 
combination of motor vehicles utilizing three or more saddle-mounts. 
(See Sec. 393.71(a)(3).)
    (3) Any full trailer, any semitrailer, or any pole trailer having a 
GVWR of 3,000 pounds or less must be equipped with brakes if the weight 
of the towed vehicle resting on the towing vehicle exceeds 40 percent of 
the GVWR of the towing vehicle.

[[Page 1065]]

[GRAPHIC] [TIFF OMITTED] TC01AP91.030

[52 FR 2803, Jan. 27, 1987, as amended at 53 FR 49398, Dec. 7, 1988; 54 
FR 48617, Nov. 24, 1989; 59 FR 25574, May 17, 1994; 61 FR 1843, Jan. 24, 
1996]