Vacuum hose failure is common due to engine heat and time. Vacuum hoses are made of plastic.
Car Problem Reports
Ford Bronco Failure of plastic vacuum lines
Ford Bronco Problem
Model Year Affected: 1995
Exhaust & Emissions Affected: 5.0L V8
Average Mileage: 161,750 mi (154,000 mi - 169,500 mi)
Visitor, 1995 Ford Bronco, 169,500 mi
All vacuum lines are failing. all plastic lines are britle. starting to replace one by one. haveing trouble finding a good diagram to work off of.
Visitor, 1995 Ford Bronco, 154,000 mi
while changig spark plugs, i had to move plastic vacuum line, and the plastic vacuum line where no longer flexable, they where very rigid and brittle, as a result they broke very easily.