Inspection of the spheres is done by observing the number of graduation that the level of the AHC fluid changes in the resevoir, when changing the ahc level from Lo to Hi.
Step by step:
1 put the ahc in Lo
2 wait for 20 secs after it has reached Lo
3 take note of the level in the ahc reservoir
4 change the ahc to High
5 wait 20 secs after it has reached Hi
6 check the level of the fluid again
The level can be read on one corner of the reservoir where there are small graduations. The amount of fluid used to change the height of the car corresponds to the reduction in volume of the gas in the 4 spheres.
Less than 7 graduations means that the spheres are shot. 14 grads means they are good as new.
Conditions for this test include:
Has to be done with an empty car.
The suspension has to be adjusted to the specified standard heights.
The Neutral Pressure has to be correct (i.e. the coil springs and torsion bars have to do their part of the lifting)