Two Handbrake Usage Methods For Semi-trailers

Semi trailers belong to air brakes, both medium trucks and customers use air brakes. The foot brake is gas, and the handbrake (parking brake) is also gas.
Dead air brake: This type of car cannot reach any air pressure after starting, and then reaches the brake booster pump through the pump, which divides the distribution valve into various pipelines and reaches the brake booster drum of each tire, converting it into a power brake.
The two handbrakes of a semi-trailer, one is the handbrake in front of the tractor, and the other is the handbrake of the trailer. A semi-trailer is a type of trailer with an axle located behind the vehicle's center of gravity (when the vehicle is uniformly loaded) and a connecting device that transfers horizontal and vertical forces to the towing vehicle.
The handbrake of a semi-trailer is an air brake. The position of the handbrake is in the storage cabinet on the right side of the driver's seat. An acceptable handle that can be seen. When pulling the handbrake, stop the car. When turning off the engine, lift the square valve that is lifted with your right hand, and then lift the handle of the elevator and pull it backwards. When emergency braking, please use the same method as braking to use the title of Lei.