Re: 1986 Ford e150
There should be a vacuum line junction around the brake booster as well. As jwko mentioned, providing the engine/exhaust isn't too loud, you should be able to hear a 'hiss' sound from a broken line.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!