Citroen DS rebuilt rear spheres

Earlier this year, I had the suspension spheres on my 1970 Citroen DS checked for pressure. The ride had become pretty terrible, so it was obvious there was a problem. We were able to successfully regas the fronts, but one of the rears was completely dead. It was time for some rebuilt rear spheres.

My mechanic sent them away to Pleiadies in Queensland. They were able to fully rebuild my rear spheres including new diaphragms, and repaint them to the factory colour and pattern. When they arrived back they looked almost too good to put on the car!

A bit […]

Citroen DS sphere regassing

The Citroen DS is known for the quality of its ride. The books use epithets such as ‘Magic carpet ride’. There is a bit of puffery in that statement, but the sentiment is right – the ride is normally very good. Recently my DS has become the worst riding car that I own. Something was clearly wrong.

The biggest impact on ride quality is the state of the suspension spheres. There are four suspension spheres, one for each wheel. In addition to the suspension spheres, a D will have at least one accumulator sphere. These store pressure for various reasons, […]

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 […]