Brake failure due to wear and tear, while not impossible, is generally avoidable with proper awareness and vehicle upkeep. This gradual erosion reduces stopping power, increasing the time and distance required for the truck to stop moving. When a truck is aggressively braking to slow downhill speed or the vehicle is fully loaded, the wear on the brakes is significantly increased. The heat generated during braking slowly chips away at the brake pads and drums. ![]() Regular wear & tear can cause a number of problems Similarly to any other type of motor vehicle, a truck’s brakes endure a constant battle against friction. It’s a testament to modern technology that a system was devised to efficiently bring vehicles weighing up to 80,000 pounds to a complete stop. Understanding each component and its role is vital for appreciating the delicate balance of forces that keeps trucks driving properly and under control. An ABS system rapidly pulses the brakes to prevent wheel lockup, so a trucker doesn’t lose control of their vehicle when braking heavily. Anti-lock braking systems (ABS): Most modern vehicles on the road have ABS systems, and commercial trucks are no exception. Spring brakes: These serve as a backup measure that automatically engages to hold the truck stationary if air pressure drops. This gives the trucker more control over how quickly their vehicle comes to a stop. Other crucial components of a truck’s braking system include: Relay valves: A truck’s relay valves direct air pressure to the appropriate brake chambers based on the driver’s pedal input. These chambers transform the air’s force into friction via housing pistons that clamp on brake pads, thus slowing the vehicle’s wheels. The compressed air passes through a network of tubes to the brake chambers. At the heart of the air brake system is the air compressor, which pumps pressurized air into the system. A complex system of air compressors, valves, and brake chambers work as one to allow truckers to control the speed of their rig. Unlike the hydraulic systems found in regular passenger cars, trucks are equipped with air brakes. How does a truck’s braking system work? Commercial trucks rely on a fascinating balance of air and metal to slow down their massive loads. In this article, we explore the mechanics of truck brakes, explain some of the possible causes of brake failure, and discuss how to keep our roads safe for everyone. ![]() ![]() Brake failure can be particularly deadly, as it can result in a trucker losing control of their rig entirely. However, large trucks can pose a threat to other vehicles on the road if they experience mechanical issues. That said, it’s not uncommon to pass dozens (if not hundreds) of large trucks while on the highway, even if you’re just doing a quick commute to work. Commercial trucks keep the American economy moving, as they stock our stores with the products we rely upon.
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