Citroen DS sphere pressure check

Today I attended a Citroen Car club tech day. Since most Citroens are equipped with hydropneumatic suspension, the club has equipment to pressure test spheres. It has been five years since I tested my spheres, so they were well overdue. The sphere pressure check equipment consists of a hand pump and pressure gauge. The club is also equipped with re-gassing facilities, although those were not available today for the rebuildable spheres in my DS21.

The tech day did have a hoist available, but my preference is to remove the spheres at home first. As with last time I removed them, […]

Citroen DS Sphere removal

Central to the Citroen DS hydraulic system is a set of ‘spheres’ that hold hydraulic pressure. The spheres have an internal diaphragm so they can contain gas on one side and hydraulic fluid on the other. One is used for each wheel to provide the suspension, as the gas forms the ‘spring’ and the amount of fluid in the sphere controls the ride height. One is used as a place to hold a buffer of system pressure, called the accumulator, and one some cars, and additional sphere provides additional brake pressure (like another accumulator, but just for the brakes).

There […]