Bendix sealed spring brake now factory option on Peterbilt trucks

The Bendix EnduraSure-Pro sealed spring brake for air disc brakes is now available as a factory-installed option across Peterbilt medium- and heavy-duty truck models. Designed to address contamination-related failures, the unit uses a sealed architecture to prevent moisture, dust, and debris from entering the spring brake chamber, which can lead to corrosion and premature failure in standard vented designs.

“The longer you own your vehicles, the greater the benefit you’ll see from avoiding frequent replacements of your spring brakes, including lower roadside service costs and reduced downtime,” said Frank Gilboy, Bendix director of Foundation Drum Brake and Actuators. “For trailers, the total cost of ownership is even lower, since fleets keep their equipment longer, and it often sits for extended periods of time. Spec’ing a sealed spring brake is especially beneficial, because standard spring brakes are more susceptible to collecting moisture.”

Bendix eliminated traditional drain holes and instead incorporated a one-way check valve into the dust plug. This allows air to escape while keeping contaminants out, reducing the risk of buildup that can clog drains and accelerate corrosion. In testing, Bendix reports the sealed design can extend power spring life up to five times compared to standard spring brakes. The unit also features a power spring engineered to minimize coil clash and a greater shut height to reduce internal stress and maintain consistent force over time.

Beyond durability, the design targets a known safety concern in air disc brake systems. A failed power spring can be difficult to detect compared to drum setups and may compromise a vehicle’s ability to hold during parking, increasing rollaway risk. By protecting the spring from contamination and corrosion, the EnduraSure-Pro is intended to help mitigate that failure mode while supporting overall brake system performance.