Valve Block rebuild

trouttramp · 2025-07-07T11:34:24+0100

Morning Gents,

Is anyone able to carry out valve block repairs for a 2000 P38 4.6 V8? My vehicle holds air at maximum height overnight when locked, but if I don’t raise it, it drops to entry height. I’ve recently replaced the air compressor and had the airbags checked, so I suspect the issue is with the more frequently used valves in the block. I’ve seen adverts for rebuilt valve blocks in the past and wanted to ask if any members offer this repair service.

marjon · 2025-07-07T11:46:40+0100

Why would it be the valve block? as it uses the same valves in any height.
It could be a leaky bag(or 2) that has a minor split that closes when in extended but opens in normal.

If you pull the relay under the passenger seat when you park it up then any leaky corner will drop but the rest will not move, it may help show whats actually leaking.

Many peeps have done it themselves (even me

) succesfully, its not difficult if you are half handy.

J

trouttramp · 2025-07-07T12:46:51+0100

cheers J,

Thanks for the info, I jumped on the valve block as it doesn't move when parked overnight or over the weekend when in extended height and locked. I i leave it in any other height it drops to entry height. The suggestion that an airbag could be leaking but not when extended may be plausible.

I will try the relay suggestion.

Cheers

Colin

marjon · 2025-07-07T12:58:53+0100

Pull the relay and let us know what happens

.

J

Mark Piercy · 2025-07-07T13:06:38+0100

Don't forget it checks it's own height over the time it is locked.
If your parked on anything other than level ground it'll always try to even itself out.

marjon · 2025-07-07T13:11:43+0100

Mark Piercy said:
Don't forget it checks it's own height over the time it is locked.
If your parked on anything other than level ground it'll always try to even itself out.

Not if the relay is out though

.
I am also guessing/assuming the comparison is being made parking in the same place

J

Mark Piercy · 2025-07-07T16:50:36+0100

marjon said:
Not if the relay is out though.
I am also guessing/assuming the comparison is being made parking in the same place

J

Upto speed lad

.
Before the relay is pulled

pwood999 · 2025-07-07T16:53:19+0100

When you say "it drops to entry height", do you mean it stays up overnight, and then drops to Access or Standard when you start the car ? If so it's not a valve block issue.

Valve Block rebuild

trouttramp

New Member

marjon

Well-Known Member

trouttramp

New Member

marjon

Well-Known Member

Mark Piercy

Well fumbled member....

marjon

Well-Known Member

Mark Piercy

Well fumbled member....

pwood999

Well-Known Member

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