The driver releases the accelerator pedal and keeps the clutch engaged. The forward kinetic energy of the truck reacts to the drive system and the engine to continue operation. The piston continues to reciprocate. The four strokes of intake, compression, expansion, and exhaust continue to cycle. Once the engine exhaust valve is started, the engine exhaust valve will be opened by the high exhaust back pressure, and the compressed high-pressure air will be discharged through the exhaust system, thereby reducing the work done by the high pressure air on the piston during the expansion stroke. Make the engine from the power output device into a power-consuming device (like an air compressor), consume the entire vehicle kinetic energy, in order to achieve the purpose of controlling or reducing the speed. Di-Tert-Butyl Peroxide,Tert-Butyl Peroxide,Bis(Tert-Butyl) Peroxide,Dtbp Di-Tert-Butyl Peroxide Jiangsu Zhongluman New Material Technology Co., Ltd , https://www.rozhmch.com