Pacbrake

Pacbrake builds air suspension for trucks — over 70 parts here, almost all of them air suspension kits and the air springs that go in them.

Air suspension does one job well: it carries a load without riding like a loaded truck when you are empty. The air springs sit between frame and axle and take pressure only when you ask them to, so a truck that hauls occasionally still rides like a truck the rest of the time.

A kit is the brackets, the springs and the air line as a matched set. Air springs are also sold on their own, because the bag is the wear item — it ages long before the hardware around it does.