§FMCSR.com
Historical textIn force on Oct. 1, 2001Source: annual CFR editions 1996–2011

§ 393.53 Automatic brake adjusters and brake adjustment indicators.

Wording first on file in the 1996 annual edition, superseded by the 2012 annual edition.

govinfo, 2001 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2001 edition's wording. An amendment that took effect between Oct. 1, 2001 and Oct. 1, 2001 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.53 — Automatic brake adjusters and brake adjustment indicators.. Text in force on October 1, 2001. This wording effective October 1, 1996 to October 1, 2012. Source: govinfo, 2001 edition, https://www.govinfo.gov/app/details/CFR-2001-title49-vol4/CFR-2001-title49-vol4-sec393-53. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.53?asof=2001-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) Automatic brake adjusters (hydraulic brake systems). Each commercial motor vehicle manufactured on or after October 20, 1993, and equipped with a hydraulic brake system, shall meet the automatic brake adjustment system requirements of Federal Motor Vehicle Safety Standard No. 105 (49 CFR 571.105, S5.1) applicable to the vehicle at the time it was manufactured.

(b) Automatic brake adjusters (air brake systems). Each commercial motor vehicle manufactured on or after October 20, 1994, and equipped with an air brake system shall meet the automatic brake adjustment system requirements of Federal Motor Vehicle Safety Standard No. 121 (49 CFR 571.121, S5.1.8) applicable to the vehicle at the time it was manufactured.

(c) Brake adjustment indicator (air brake systems). On each commercial motor vehicle manufactured on or after October 20, 1994, and equipped with an air brake system which contains an external automatic adjustment mechanism and an exposed pushrod, the condition of service brake under-adjustment shall be displayed by a brake adjustment indicator conforming to the requirements of Federal Motor Vehicle Safety Standard No. 121 (49 CFR 571.121, S5.1.8) applicable to the vehicle at the time it was manufactured.

[60 FR 46245, Sept. 6, 1995]

Amendment history

2 distinct wordings on file since Oct. 1, 1996
  1. Oct. 1, 2012 → presentannual editions 2012–2016diff vs. previous
    [60 FR 46245, Sept. 6, 1995, as amended at 77 FR 46639, Aug. 6, 2012]
  2. Oct. 1, 1996 → Oct. 1, 2012annual editions 1996–2011viewing
    [60 FR 46245, Sept. 6, 1995]

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.