Imperial Parking Brake Vacuum Release Adj. (1967-73)
Place transmission in "D", with engine off. Remove vacuum hoses from unit. Detach vacuum unit from steering column jacket. Move actuating arm on valve against spring to extreme position, or until locating holes line up. Insert a number 42 drill in hole, to position valve for installation. Move transmission selector to "P". Place valve in position on column jacket and install, but do not tighten, attaching screws. Rotate valve clockwise (as viewed from driver's position) until actuating arm contacts tab inside steering column jacket. Tighten retaining screws. Remove drill. Install vacuum hoses. Start engine and check that parking brake can be set in "N" and "P" and will release in "R" and "D".