Hi All

I need some help with a 2010 RRS Suspension. The car is lower on the left Rear by about 25mm (uk passenger side). The car does not level up when running, when I start the car the pump runs and fills the reservoir to 1750kPa then stops and dumps all the pressure to between 100-200kPa. The pump sometimes cuts out with the fault code (Pressure increases too slow when filling reservoir). I have tried another pump but doesn't seem to make a lot of difference. On a diagnostics tool the suspension height on the back tends to be 20-35mm in difference. I have left it over night with the fuse out and the car does not drop. It always stays up just with the difference (20mm ish) between the two back wheels.

This fault showed up when we had the very cold temperatures (below 0) a week or two ago.

Any suggestions ???

TIA.....

Usually a leak at the tank they rust out, our d3 did exactly the same. Spray with soapy water to check the tank.

HI

Thank you, can I ask did yours pump up then discharged it all at once?

Yeah I think it did, it also wore out the piston and barrel due to the pump running for to long trying to get gallery pressure.
New piston and barrel sorted it along with a replacment air tank.

Have a look here
https://disco3.co.uk/forum/new-suspension-compressor-197388.html

Diagnosis is a logical step by step process.

Raise the suspension to the max. Pull suspension fuse, measure the heights of each corner. Wait 5-6 hours min, then re- measure. If any corner has dropped, it’s either that corner’s airbag or air connections leading to that corner. If all connections of a corner test okay, suspect the front or rear valve block. At this point, you have half the job done.

The rest are the common connections of the air pump, air tank and central valve block or those components.

dave421 wrote:

Hi All

I need some help with a 2010 RRS Suspension. The car is lower on the left Rear by about 25mm (uk passenger side). The car does not level up when running, when I start the car the pump runs and fills the reservoir to 1750kPa then stops and dumps all the pressure to between 100-200kPa. The pump sometimes cuts out with the fault code (Pressure increases too slow when filling reservoir). I have tried another pump but doesn't seem to make a lot of difference. On a diagnostics tool the suspension height on the back tends to be 20-35mm in difference. I have left it over night with the fuse out and the car does not drop. It always stays up just with the difference (20mm ish) between the two back wheels.

This fault showed up when we had the very cold temperatures (below 0) a week or two ago.

Any suggestions ???

TIA.....

erickwan wrote:

Diagnosis is a logical step by step process.

Raise the suspension to the max. Pull suspension fuse, measure the heights of each corner. Wait 5-6 hours min, then re- measure. If any corner has dropped, it’s either that corner’s airbag or air connections leading to that corner. If all connections of a corner test okay, suspect the front or rear valve block. At this point, you have half the job done.

The rest are the common connections of the air pump, air tank and central valve block or those components.

Either valve block, then. Regards etc.,

Wojtek

---
WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

Hi

Thanks for the reply, can I ask why when I start the engine the pump builds pressure up from around 200 to 1750 ish the pump stops and instantly dumps all the pressure down to around 200kpa ?

dave421 wrote:

erickwan wrote:

Diagnosis is a logical step by step process.

Raise the suspension to the max. Pull suspension fuse, measure the heights of each corner. Wait 5-6 hours min, then re- measure. If any corner has dropped, it’s either that corner’s airbag or air connections leading to that corner. If all connections of a corner test okay, suspect the front or rear valve block. At this point, you have half the job done.

The rest are the common connections of the air pump, air tank and central valve block or those components.

HI I did this and it stayed at the height I left it at 24hrs previous (it did not level before the test) ???

dave421 wrote:

Hi

Thanks for the reply, can I ask why when I start the engine the pump builds pressure up from around 200 to 1750 ish the pump stops and instantly dumps all the pressure down to around 200kpa ?

👍

I made a few additions to my post above.

Duh! I just woke up after a night of heavy drinking.

Hi

Thank you, makes total sense 👍

erickwan wrote:

dave421 wrote:

erickwan wrote:

Diagnosis is a logical step by step process.

Raise the suspension to the max. Pull suspension fuse, measure the heights of each corner. Wait 5-6 hours min, then re- measure. If any corner has dropped, it’s either that corner’s airbag or air connections leading to that corner. If all connections of a corner test okay, suspect the front or rear valve block. At this point, you have half the job done.

The rest are the common connections of the air pump, air tank and central valve block or those components.

HI I did this and it stayed at the height I left it at 24hrs previous (it did not level before the test) ???

You now have 2 issues. The rear did not level out, and you have the fault “…filling too slowly”. I assume the suspension freezes and the pump stops running when you flag that error. This is usually due to an air leak in the vicinity of the pump….pump connections, centre valve block connections, reservoir connection, reservoir tank or centre valve block, or else the intake filter to the pump is blocked. Also, do not ignore the gallery pressure sensor which can go bad, albeit rare. And the compressor/pump itself which can progressively weaken over time.

Once you get the pump running successfully, the mismatch in the rear height is a case of re-calibration or you have a bad height sensor, since it’s been tested and there seem to be no leaks in this vicinity.

If you crack the Voss connector to the reservoir and there is no air escaping, then it’s either the reservoir itself that’s leaking or the centre valve block.

The centre valve block has only one function, controlling the air in and out of the reservoir.