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Rust jacking is the accumulation of rust between the brake shoe and lining. As the rust builds, sometimes to a thickness of 1/8th of an inch or more, it pushes outward against the lining, “jacking” it against the rivets and causing it to crack. Once the lining cracks, it begins to lose its stopping power and must be replaced – often while there’s still plenty of usable friction life remaining.
Where Does Rust Jacking Occur?
The problem is most commonly found on trucks that travel in and out of snowy regions, since many cities and states now use stronger chloride-based chemicals such as calcium chloride and magnesium chloride rather than salt to keep roads passable during inclement winter weather. While these compounds do a great job melting dangerous ice and snow, they can also seep between the brake shoe table and lining, triggering rust formation.
Although all of a truck’s axles are at risk, steer axles are more susceptible to rust jacking. That’s because steer axles are more likely to make contact with snow and slush that has been treated with de-icing chemicals, and they normally run cooler than other brakes.
But rust jacking isn’t confined only to the North. In fact, warm coastal areas are also prone to corrosion, since the high humidity and saltwater combine to create the same damaging properties as chemical de-icers.
Want to protect your truck’s braking system from rust jacking? Follow this three-step plan:
Drive success with a full brake system inspection from the service experts at your local Volvo Trucks dealership. Whether you need replacement linings or new shoes, we have high-quality OEM and remanufactured products on hand and ready to install. Or, order online from the SELECT Part Store™ for immediate stock confirmation and next-day delivery.