The disc brake axles, also known as the plate type axles, is named after the shape of the metal block used in it. When braking, the calipers are fell to the brake plate, and the friction has a braking effect, the semi trailer which is applied more on the passenger trailer.However, with the implement

When winter comes, some card friends report that their trailers are slow to brake due to the weather cooling, and the relay valve is frozen, causing the brakes to lock up, the semi trailer brake system which is a great safety hazard. The semi trailer manufacturer will briefly introduce how to mainta