There are two yellow lines coming out of the firewall. one is bright yellow and the other is a darker yellow. Are these for the door locking system? If so where do they connect to the vacuum system?.
They'd tee into the big hose to the brake booster somewhere, through check valves. The bright one is the door locks, the darker one would be something else. Vacuum reservoir? If so, it should _only_ feed vacuum to the door locks, so the check valving and line splitting would be arranged accordingly. Possibly a 2-output check valve.
-- Jim
