just spoke to george murphy,performance analysis.he told me that when vac is applied, diaphragm should go up or down and stay there until opposite side has vac applied.mine go down with vac ,but dont hold.thats a sign of leakage.im getting new diaphragms from him and replace them all-13 including trunk,i have no gas actuator,must have been removed.

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95 e320,87 sdl,79 300sd