§FMCSR.com
Historical textIn force on Sept. 30, 1998Source: annual CFR editions 1996–2004

§ 393.207 Suspension systems.

Wording first on file in the 1996 annual edition, superseded by the 2005 annual edition.

govinfo, 1996 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 1996 edition's wording. An amendment that took effect between Oct. 1, 1997 and Sept. 30, 1998 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates. govinfo does not publish the 1997 edition of Parts 300–399 in machine-readable form, so the 1996 text is shown for that year.
49 CFR § 393.207 — Suspension systems.. Text in force on September 30, 1998. This wording effective October 1, 1996 to October 1, 2005. Source: govinfo, 1996 edition, https://www.govinfo.gov/app/details/CFR-1996-title49-vol4/CFR-1996-title49-vol4-sec393-207. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.207?asof=1998-09-30, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) Axles. No axle positioning part shall be cracked, broken, loose or missing. All axles must be in proper alignment.

(b) Adjustable axles. Adjustable axle assemblies shall not have locking pins missing or disengaged.

(c) Leaf springs. No leaf spring shall be cracked, broken, or missing nor shifted out of position.

(d) Coil springs. No coil spring shall be cracked or broken.

(e) Torsion bar. No torsion bar or torsion bar suspension shall be cracked or broken.

(f) Air suspensions. The air pressure regulator valve shall not allow air into the suspension system until at least 55 psi is in the braking system. The vehicle shall be level (not tilting to the left or right). Air leakage shall not be greater than 3 psi in a 5-minute time period when the vehicle's air pressure gauge shows normal operating pressure.

Amendment history

2 distinct wordings on file since Oct. 1, 1996
  1. Oct. 1, 2005 → presentannual editions 2005–2016diff vs. previous
    [53 FR 49402, Dec. 7, 1988, as amended at 70 FR 48055, Aug. 15, 2005]
  2. Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004viewing

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.