Vacuum Tests: Notes
WARNING: This page is about a different car, the 2000 Mercedes-Benz C43, 2000 Mercedes-Benz C280, 1999 Mercedes-Benz C43, and 1999 Mercedes-Benz C280. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before performing any vacuum testing, verify Gray vacuum hose to intake manifold is not leaking. Permissible leakage of system (including vacuum lines) at 11" Hg (400 mbar) is .8" Hg (30 mbar) per minute.