The Recall Desk
Our severity:SevereNHTSA·25E027000·Announced 2025-04-14

Nova Bus Recalls ZF Brake Chambers Due to Air Leak Risk

Nova Bus is recalling specific ZF brake chambers sold as replacement parts for buses because improper manufacturing may cause air leaks, increasing the risk of unexpected braking, overheating, or fire.

What this means for you

Our assessment, not the agency’s: severity 4/5 (Severe).

The hazard poses a serious risk of illness, injury, or structural failure. Stop using the product immediately and contact the manufacturer for a refund or repair.

Our severity reasoning: The recall involves a structural vehicle defect (brake chamber) that can lead to unexpected braking, overheating, fire, and crashes, meeting the criteria for a Severe rating.

Plain-English summary

Nova Bus (US) Inc. is recalling certain ZF North America Knorr-Bresme 20/22-57 brake chambers, part number K038830N00, which were sold as replacement parts for certain buses. The recall is due to improper manufacturing of the brake chambers, which can result in an air leak.

An air leak in the brake chamber may cause the brakes to engage unexpectedly. This unexpected engagement can overheat the brakes, increasing the risk of a fire. Additionally, the unexpected braking action can increase the risk of a crash.

Nova Bus will replace the affected brake chambers free of charge. Owner notification letters were mailed on August 21, 2025. Owners may contact Nova Bus customer service at 1-450-472-6410 for assistance. Nova Bus's number for this recall is CR5720. Owners may also contact the NHTSA Vehicle Safety Hotline at 1-888-327-4236 or visit www.safercar.gov.

The recalled product

Product
SERVICE BRAKES, AIR:DISC:CHAMBER recall
Manufacturer
Nova Bus (US) Inc.
Category
Vehicle — Brake System
Hazard
Affected units
2,090

Distribution

Distributed nationwide across the United States.

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