Historical textIn force on Sept. 30, 2003Source: annual CFR editions 1996–2006

§ 393.49 Single valve to operate all brakes.

Wording first on file in the 1996 annual edition, superseded by the 2007 annual edition.

govinfo, 2002 edition ↗

Compare with

Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2002 edition's wording. An amendment that took effect between Oct. 1, 2002 and Sept. 30, 2003 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.

49 CFR § 393.49 — Single valve to operate all brakes.. Text in force on September 30, 2003. This wording effective October 1, 1996 to October 1, 2007. Source: govinfo, 2002 edition, https://www.govinfo.gov/app/details/CFR-2002-title49-vol4/CFR-2002-title49-vol4-sec393-49. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.49?asof=2003-09-30, on October 26, 2026. Unofficial compilation; verify against the official source.

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 § 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.

Amendment history

3 distinct wordings on file since Oct. 1, 1996

Oct. 1, 2013 → presentannual editions 2013–2016diff vs. previous
[72 FR 9871, Mar. 6, 2007, as amended at 78 FR 58484, Sept. 24, 2013]
Oct. 1, 2007 → Oct. 1, 2013annual editions 2007–2012diff vs. previous
[72 FR 9871, Mar. 6, 2007]
Oct. 1, 1996 → Oct. 1, 2007annual editions 1996–2006viewing

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.