Thread: Advice Needed - Intermittant Suspension Fault

Could be a valve block issue?

I was surprised to find significant cracking on a fold inside my D4's rear airsprings after only 95K kms, to the extent that all springs were replaced when the shocks were subsequently replaced because I thought they could soon start to leak. However my airsprings and shocks get a good workout and D3/4's go lower than RRS's so perhaps are subjected to more movement than some.

Originally Posted by CaverD3

Could be a valve block issue?

Anyone have any more info on this ? Cheers

There is a rear valve block and a front valve block. Each block contains the left, right and cross-link valves. If a left or right valve isn't sealing properly then some pressure will escape but it shouldn't be able to escape totally because it has to vent through the exhaust valve which only opens under ecu control or mechanically if there's excessive pressure in the line to it, eg if the compressor never cuts out and raises the pressure too high. A leak can occur where a pipe connects to a valve block or the valve block splits where 1 pipe connects or in a pipe between the valve block and the airspring and that will allow the attached airspring to deflate. However your vehicle doesn't seem to have a permanent leak hence my suspicion of a crack in air airspring that only opens-up with the suspension in a specific position or when loaded more than usually.