1 row of parking space:

 In the driving state, the compressed air passes through the (intake) air port 1 and the open intake valve (1), to the (outlet) air port 21, and the spring energy storage control chamber is charged.

 2 System moving position:

When braking, the convex wheel (2) will push the rod (3) down, the intake valve (1) closed, the exhaust valve (6) open, the outlet 21 through the exhaust port 3 exhaust.

 When the leveling plug (5) moves down in the spring (4), the exhaust valve (6) is closed and the intake valve has not been opened, the leveling is reached, and a system overrun process is realized