What 393.45D-BHS means in plain language
When you receive a 393.45D-BHS citation, an inspector found that your brake tubing or hoses were worn, chafed, crimped, or otherwise damaged. This isn't about whether your brakes work—it's about the physical condition of the tubes and hoses that carry brake fluid and air to your brake components.
Damage to brake lines can range from visible cracking or splits to crushing, kinking, or contact with sharp edges that frays the outer covering. Chafing happens when tubing rubs against frame edges, other components, or debris. Crimping occurs when brake lines are bent or pinched during installation, repair, or accident damage. Any of these conditions can eventually lead to brake fluid or air leaks, making your braking system unreliable.
This is a vehicle maintenance violation—your truck failed to meet the required condition standard, not because of how you drove it, but because the equipment itself wasn't fit. The citation applies to the vehicle condition at the moment of inspection.
What our enforcement data actually shows
Across our inspection records of 13 million+ roadside checks, 393.45D-BHS is a rare citation—only 52 all-time, with 30 in the last 12 months and 5 in the last 90 days. This code ranks #1617 out of 3,036 FMCSR codes by citation volume.
What matters most: the out-of-service rate is extremely high. Our data shows that of all 52 times this violation was cited, 47 vehicles (90.4%) were placed out of service. That's nearly triple the all-FMCSR average out-of-service rate of 31.4%. When an inspector writes this citation, it's almost certain your truck will be ordered off the road until the brake lines are repaired.
In the last 90 days, we saw 5 citations. Monthly volume has been volatile but is trending upward—November 2025 saw a spike to 8 citations, all resulting in out-of-service orders.
Who gets cited most
Over the last 180 days, enforcement has been concentrated in a small number of states. Texas leads with 4 citations, and New Jersey, Pennsylvania, and Maryland each have 2 citations. California also has 2 citations but at a lower out-of-service rate of 50.0%, compared to 100.0% rates in TX, NJ, PA, and MD.
Our all-time data shows Ford vehicles account for 11 citations, followed by Freightliner with 6 and International with 5. This reflects the composition of heavy-duty trucks on the road, but it also suggests brake line damage is being caught more often on certain makes—likely due to age and accumulated wear patterns.
A few carriers appear more than once in our records: Luis Eusebio Salgado Esquer (USDOT 557042), Max Trans LLC (USDOT 1188508), and Faith Electric and General Building Contractors LLC (USDOT 2718140) each have 2 citations. This reflects operational exposure to inspections and the unpredictable nature of maintenance discovery at roadside checks.
How severe is this compared to similar codes
In the vehicle maintenance category, 393.45D-BHS sits at the extreme end of enforcement consequences. Compare it to peer codes:
- 393.9(a) — Inoperable required lamps: 660,737 citations but only 15.4% OOS rate. Brake tubing damage is cited far less often (52 vs. 660k) but results in immediate out-of-service roughly 6 times more often.
- 396.3(a)(1) — Inspection/repair/maintenance general: 236,919 citations with 45.3% OOS rate. This is a broader violation, but again, brake tubing damage has a much higher out-of-service consequence despite lower frequency.
- 393.47E — Slack adjuster defective: 180,363 citations with 0.0% OOS rate. This brake-related issue is cited hundreds of times more often, yet rarely results in out-of-service, indicating that brake tubing damage is treated as a more critical safety defect.
The gap between our code's 90.4% OOS rate and the 0.0%–45.3% rates of similar maintenance violations shows that inspectors view brake line integrity as non-negotiable for safe operation.
How to avoid it
Brake tubing and hose damage is preventable with disciplined pre-trip and periodic inspection:
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Walk the undercarriage and wheel wells every day. Run your hands along brake lines where they're accessible. Feel for soft spots, cracks in rubber hoses, or areas where the outer cover is worn through. Pay special attention to the driver side and passenger side rear axles—brake lines in these areas are vulnerable to road debris and environmental exposure.
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Look for contact points and chafing. Trace brake lines from the frame toward wheels and brake components. If a line touches a sharp edge, frame bracket, or another component, it will eventually chafe through. Ask your shop to secure any loose or rubbing lines with proper clips and padding.
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Inspect for crimping and kinks. If your truck has had recent brake work, suspension repair, or accident damage, brake lines may have been bent or pinched during reinstallation. Bent lines can also develop fatigue cracks over time. Insist that your technician use approved line routing and benders—never force a line into place.
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Check hose condition regularly, especially on older trucks. Rubber hoses degrade in sunlight, heat, and ozone. On vehicles older than 8–10 years, hoses may be cracking internally or externally without obvious failure. Freightliner and International trucks in our data have seen multiple citations; if you drive an older unit of these makes, prioritize hose inspection at every PM.
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Document your inspections in writing. Keep a log or photos of brake line condition checks. If you're cited and believe the damage was recent (e.g., caused by road debris the same day), your documented history shows you were maintaining the equipment before the incident.
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Communicate with your fleet's maintenance team. If you notice a soft brake response, a slight fluid leak under the truck, or visible cracks in hoses, report it immediately. Don't wait for a roadside inspection to reveal the problem—a maintenance repair is far cheaper and faster than an out-of-service order.