F 250 2WD Pickup V8-6.9L DSL (1985)
Vacuum Check
^ Is vacuum at or above specified level?
YES -- Go to A5. See: A-5 Brake Booster Check
NO -- Go to A6. See: A-6 Leak Check
A-5 Brake Booster Check
^ Depress brake pedal and hold.
^ Repeat step A4, vacuum system check. See: A-4 Vacuum System Check
^ Is vacuum 10kPa (3 inches hg) or above?
YES -- Check hydraulic system.
NO -- Replace brake booster.
A-6 Leak Check
^ Check all attaching hoses for leaks.
^ Is there a leak?
YES -- Service as required.
NO -- If vacuum is still low, check all vacuum accessories for out-of-specification leaks. Repair or replace as required.
