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Unless the suspension is at either extreem..on the stops...then bouncing is due to accumalators .
They act as fluid reserves. They are initially filled with a nitrogen charge of 2500 psi . Physics dictates that the molecules of nitrogen will bleed through the rubber buffer diaphram in a priod of around 6 to 8 years leading to a sphere with no cushion of nitrogen for the displaced fluid in the shocks to flow to or from.
When this happens, the shock fluid is dead headed and shocks will not move because there is no room in the sphere for the fluid the shocks displace to go and it cannot go through the control unit fast enough due to line restriction.
The only up/down movement left is shock mount rubbers and tyres.
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