What is the relationship between the service brake and parking brake of a truck?
2 Answers
Service brake is the foot brake, commonly known as the foot brake; parking brake is the brake used when parking, commonly known as the hand brake. The following is a related introduction about brakes: 1. Terminology explanation: A mechanical braking device that can slow down the speed of a vehicle, also known as a decelerator. The car brake pedal is located under the steering wheel. Pressing the brake pedal causes the brake linkage to be pressurized and transmitted to the brake shoes on the brake drum, clamping the brake disc to slow down or stop the vehicle. 2. Brake function: The principle of braking is to convert the kinetic energy of the vehicle into heat energy and dissipate it. The kinetic energy comes from the power provided by the engine, which requires fuel combustion to do work. In other words, every time you step on the brake, it means a little gasoline is wasted.
I think the service brake and parking brake on a truck are like a pair of partners, each with its own role but neither can be missing. The service brake is the foot pedal we usually press while driving, specifically used to slow down or make emergency stops during motion. The parking brake, on the other hand, is that hand lever or pull rod—when the vehicle is parked, you engage it to prevent accidental rolling. Their relationship is such that the service brake is responsible for bringing the vehicle to a stop, while the parking brake ensures it stays put without slipping away. Only by working together can they guarantee safety. Especially in trucks, where the weight and inertia are significant, relying solely on the service brake when parked on a slope might allow the vehicle to slide—this is where the parking brake comes into play. As someone who drives long-haul trucks regularly, I always check that the parking brake is firmly engaged before getting out, and I perform regular maintenance to ensure both systems remain flexible and functional. If the service brake develops issues and feels spongy when pressed, or if the parking brake fails, the vehicle might move unexpectedly, leading to accidents. Both are part of the braking system but differ in structure—trucks often use pneumatic or hydraulic systems for service brakes, while parking brakes typically rely on mechanical cables. During maintenance, it’s essential to inspect both for wear or air leaks. Overall, one manages motion, the other manages stillness, and together they form the cornerstone of parking safety.
