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The National Highway Traffic Safety Administration (NHTSA) has concluded its investigation into potential defects in Haldex brake chambers used in commercial vehicles, specifically focusing on parking brake components. This probe, identified as Preliminary Evaluation PE21018, stemmed from reports of wheel-end fires and spring fractures in brake chambers manufactured by Haldex Commercial Vehicle Systems. The evaluation highlighted risks associated with these failures, particularly in vehicles operating in corrosive environments, but noted that proactive fleet actions and the age of the components have mitigated ongoing concerns.
Key Highlights
- Eleven Vehicle Owner Questionnaires (VOQs) triggered the investigation, including seven wheel-end fires on Kenworth and Peterbilt trucks.
- Fractured power springs punctured brake chamber diaphragms, leading to partial air loss, brake drag, and overheating.
- Warranty claims analysis showed average service life of 4.9 years and 260,000 miles, exceeding Haldex’s four-year warranty.
- No recent failures reported, with components now aged five to ten years, beyond typical service life of two to four years.
- Investigation closed without finding a safety defect, but NHTSA reserves rights for future action.
Investigation Origins and Findings
The Office of Defects Investigation (ODI) initiated the evaluation based on VOQs submitted by vehicle owners and maintenance facilities. These reports detailed incidents where Haldex brake chambers experienced power spring fractures, compromising the parking brake system. In affected cases, the broken springs damaged the diaphragm, causing a loss of compressed air that resulted in brakes dragging and generating excessive heat, potentially leading to fires.
ODI’s thorough review included an information request letter sent to Haldex, followed by a comprehensive response from the manufacturer. The agency examined thousands of warranty claims and fleet replacement reports, alongside data from multiple vehicle manufacturers. Legal testimony and laboratory analyses further revealed that corrosion often initiated spring failures, making them detectable shortly after occurrence. Notably, some operators continued driving after detecting issues, heightening fire risks instead of halting for immediate repairs.
Scope and Affected Vehicles
While over twenty entities sourced brake chambers from Haldex, the VOQs primarily involved PACCAR vehicles, such as Kenworth and Peterbilt trucks. The majority of incidents originated from salt-belt states, where road salt accelerates corrosion and shortens component lifespan. Industry standards recommend replacing brake chambers every two to four years, with more frequent intervals in harsh conditions. Haldex’s four-year, unlimited mileage warranty aligns with these guidelines, but real-world data indicated failures often beyond this period.
Haldex proactively conducted replacement campaigns for several PACCAR-operating fleets, significantly reducing the potential for additional failures. This collaborative effort between manufacturers, fleets, and the supplier underscores the importance of maintenance in commercial vehicle safety.
Closure Rationale and Implications
Given the absence of recent failures and the advanced age of the subject components—now exceeding their expected service life—ODI determined that further investigation was unwarranted. The closing does not equate to a definitive ruling that no safety-related defect exists. NHTSA emphasizes its ongoing vigilance, reserving the authority to reopen or expand actions based on emerging data.
For stakeholders in the trucking industry, this outcome reinforces the need for rigorous maintenance schedules, especially in corrosive regions. Fleets are encouraged to monitor brake systems closely, adhering to manufacturer recommendations to prevent similar issues. Accessing ODI reports via NHTSA.gov provides deeper insights into the evaluation process and cited documentation.
This resolution highlights broader lessons in automotive defect investigations: timely detection, swift remediation, and environmental factors play critical roles in mitigating risks. As commercial vehicles continue to evolve, such probes ensure accountability and enhance road safety standards.
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