Air Suspension Leak Down after Sitting 2 Weeks

[Big Mama]

You want that to happen so they don’t throw parts at it and claim it’s fixed, only to find the opposite.

 

[Polo08816]

You want that to happen so they don’t throw parts at it and claim it’s fixed, only to find the opposite.

Since failure isn't always immediate detection on an air suspension system. Finding leaks in a system that spans across the entire wheelbase is not the simplest and quickest of tasks.

 

[WalleyeMikeIII]

Since failure isn't always immediate detection on an air suspension system. Finding leaks in a system that spans across the entire wheelbase is not the simplest and quickest of tasks.

Right, well, we do know it is in the rear.
We also know that the compressor and the reservoirs hold pressure (because the system can raise the vehicle on key on, without the aid of the compressor running).
So, at that point the possible leak points are, I think:
Air springs themselves
Fittings on the output side of the control valves.
Hoses from Control Valve Output to air springs.

 

[Doubeleive]

Right, well, we do know it is in the rear.
We also know that the compressor and the reservoirs hold pressure (because the system can raise the vehicle on key on, without the aid of the compressor running).
So, at that point the possible leak points are, I think:
Air springs themselves
Fittings on the output side of the control valves.
Hoses from Control Valve Output to air springs.

in 99.999999% of situations it's either a bladder leaking, or the relief valve on the pump.
the lines could be from the 1970's and won't leak....... the design has been the same since then
soap and water will tell you which is the case

 

[WalleyeMikeIII]

in 99.999999% of situations it's either a bladder leaking, or the relief valve on the pump.
the lines could be from the 1970's and won't leak....... the design has been the same since then
soap and water will tell you which is the case

You may be referring to the older "real leveling models" vs this four corner air suspension in the T1's. This design is different than the stuff that was on the previous models...
The previous version had the shock and the air bladder integrated.
This version has the "Air Spring" separate from the shock.
See P/N 85521600 and P/N 85619254

The Older stuff had rear leveling shocks/bladders integrated, here is the 2013 Example.
P/N 23487280

 

[Doubeleive]

You may be referring to the older "real leveling models" vs this four corner air suspension in the T1's. This design is different than the stuff that was on the previous models...
The previous version had the shock and the air bladder integrated.
This version has the "Air Spring" separate from the shock.
See P/N 85521600 and P/N 85619254

The Older stuff had rear leveling shocks/bladders integrated, here is the 2013 Example.
P/N 23487280

i see, different design, same concept...
the most likely place to "find" a leak is the bladders, or pump intake or relief valve (circled in 2nd pictured), the manifold is not likely to be bad but who knows with GM cheaping out anymore. just spray everything with soap & water mix and watch for bubbles

 

[Jayphred]

Can't find a leak..GM says try new rear air shocks.

 

[Jayphred]

Isn’t that better than not?

3 times I took it in and told them it was leaking they kept reprograming modules. Now they acknowledge its a leak not programing. Told me nothing wrong it was within spec also. Also said 'no code no problem".