Slow Rising Suspension

[stui]

Hi,I have a 2.0 HDi Xantia Exclusive 1999,every morning the suspension is slow to come up,then during the rest of the day it comes up as normally. When you turn the engine off the suspension sinks. Was wondering if this could be the anti-sink valve playing up. I had a look under the vehicle back and front and in total it has 8 sphere's. The car has a full service history showing that 6 of the sphere's were changed in 2007. Do they require to be changed again as I've seen that they should be done every 3 years as a matter of course.

 

Many Thanks

[kfk]

The Anti sink valves do as their name suggests!.........so does the suspension sink over night or is it just slow to rise?

[stui]

It sinks as soon as the engine is switched off at any time,but as soon as you restart the engine it rises normally.............and yes its slow to rise once it has been left overnight.

[kfk]

does it sink back and front or just one end?

[stui]

Its the rear that sinks,front seems to be ok.

[Johndouglas]

Before you worry to much about the anti-sink valve, I would check the accumulator sphere at the front of the car. With the engine running listen for the clicking from the regulator. Ideally it should click about twice in a minute. If it's much more, then the sphere isn't holding pressure. One purpose of the rear anti-sink valve is to close when it detects a loss of pressure from the system when the engine is turned off, ensuring that some pressure is maintained for the braking system.

[stui]

Ok just returned from the car,its clicking a couple a times a minute from the front,so I'm gathering that's correct. Turned the engine off and the rear is sinking.So would it pay me to change all 8 sphere's seeing as they were done over 3 years ago..?