Truck brake lining is a crucial component of the braking system of a truck that helps to slow down or stop the vehicle. It is a replaceable part that is attached to the brake shoe, which is pressed against the rotating drum to create friction and bring the truck to a halt.

Brake lining is typically made of a composite material consisting of heat-resistant fibers, binders, and friction modifiers. These materials are formulated to withstand high temperatures and provide consistent stopping power and durability over the life of the brake lining.

When the driver presses the brake pedal, hydraulic pressure is generated, which forces the brake shoe to press against the rotating drum. As a result, the friction between the brake lining and the drum generates heat, and the kinetic energy of the moving truck is converted into thermal energy, which is then dissipated into the surrounding air.

Over time, the brake lining will wear down, and the thickness of the lining will decrease. This wear and tear are normal and expected, but it is essential to replace the brake lining before it becomes too thin, as this can compromise the braking performance of the truck and increase the risk of accidents.

In summary, the truck brake lining is a critical component of the braking system, providing friction against the rotating drum to slow down or stop the vehicle. It is made of heat-resistant materials and needs to be replaced periodically to ensure the braking system's proper function and safety.