What 393.45A-BHTBS means in plain language
This violation addresses the physical condition of your brake system's tubing and hoses. The regulation focuses on brake tubing or hoses that show wear, chafing, crimping, or other damage. In practical terms, an inspector is looking for visible deterioration: cracked rubber, bare metal showing through, evidence of rubbing against frame or other parts, dents or kinks in rigid tubing, or bulging that suggests internal degradation.
Brake tubing and hoses are critical because they deliver brake fluid under pressure to your wheels. Damage compromises that system's integrity. Even small ruptures or leaks can reduce braking force or cause complete brake failure under load. Because brake function is fundamental to roadside safety, inspectors treat this violation with high enforcement priority.
What our enforcement data actually shows
Across our 13 million inspection records, 393.45A-BHTBS has appeared 1,121 times all-time, with 729 citations in the last 12 months and 156 in the last 90 days. That ranks this code #686 out of 3,036 FMCSR codes by citation volume—mid-range in frequency, but not rare.
The most striking statistic: 95.6% of citations for this code result in an out-of-service order. That is far above the all-FMCSR average of 31.4%. Put plainly, if you are cited for 393.45A-BHTBS, your truck will almost certainly be pulled from service on the spot. You will not drive away. The inspector will red-tag your vehicle, and you will need to arrange repairs before returning to the road.
Monthly trends over the past year show consistent citation activity, with a low of 27 in April 2025 and a peak of 71 in July 2025. Most months see 60–70 citations, suggesting this violation is steady throughout the year rather than seasonal.
Who gets cited most
Our data shows the highest concentration of citations in California, Texas, and Missouri over the last 180 days. California led with 107 citations; Texas followed with 90. Missouri, despite fewer absolute citations (32), stands out because 100% of those citations resulted in out-of-service orders—a rate matching Arizona, Utah, Washington, Wyoming, Arkansas, Wisconsin, and South Carolina.
Texas showed a 94.4% out-of-service rate, while California's rate was 90.7%—slightly lower but still well above the national average. The variation across states likely reflects differences in roadside inspection frequency and inspector training emphasis on brake systems.
Among carriers, our records show fleets such as Evans Delivery Company, Federal Express, C R England, Saia Motor Freight, and J B Hunt each with 4 citations all-time. These are major carriers with large fleets; the raw count reflects fleet size rather than a disproportionate safety problem. However, it underscores that this violation reaches across all carrier types and sizes.
How severe is this compared to similar codes
In the same vehicle maintenance category, this code stands out for its out-of-service rate. Compare it to nearby codes: 393.9 (Inoperable Required Lamp) has 660,737 citations but only a 15.4% OOS rate. The Slack Adjuster Defective code (393.47E)—which commonly co-occurs with brake tubing damage—has logged 180,363 citations with 0.0% out-of-service rate, though that may reflect citation without roadside enforcement.
Most relevant is 396.3(a)(1) (Inspection/Repair/Maintenance general), which has 236,919 citations and a 45.3% OOS rate. Even that permissive code is pulled from service less than half the time. At 95.6%, brake tubing and hose damage is enforced far more strictly, signaling that inspectors view it as a showstopper defect.
How to avoid it
Brake system defects do not appear overnight. They develop through wear, corrosion, and impact. Here is what you can do:
Before every trip:
- Walk around your tractor and trailer. Look under the frame for visible brake lines. Run your hand along rigid tubing and flex hoses to feel for rough spots, cracks, bulges, or soft sections.
- Check for signs of chafing where tubing passes near sharp edges, mounting brackets, or suspension components. If you see bare metal or worn rubber, it is time for maintenance.
- Look for evidence of leaking brake fluid—dark stains or wet patches on tubing or the ground.
During maintenance intervals:
- Have your shop inspect all brake tubing and hoses, not just the brakes themselves. Our data shows 393.47E (Slack Adjuster Defective) appears alongside brake tubing citations 28 times in the last 90 days—these systems are interdependent.
- Request replacement of any hose showing age-related cracking, even if it is not yet leaking. Prevention is cheaper than a roadside out-of-service order.
- Ensure routing clamps and strain relief are secure, so vibration does not cause tubing to rub.
Vehicle-specific attention:
- Our records show Freightliner (207 citations) and Peterbilt (64 citations) vehicles appear frequently in brake tubing violations. If you operate one of these makes, add brake line inspection to your standard pre-trip.
- Older or higher-mileage units are more prone to tubing degradation. Budget for scheduled replacement of brake hoses as preventive maintenance, not reactive repair.
The 95.6% out-of-service rate means this violation has real financial teeth. A single citation can cost you a day of lost revenue, repairs, and potential delay of freight. Regular inspection and timely hose replacement are the only reliable defense.