Check Valve Test
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect vacuum hose from check valve. Remove check valve and seal from power brake unit. Apply 15-20 In. Hg to large end of check valve. If vacuum does not hold, replace check valve.