PDF associated: /PT 50-0002.pdf

---

JDA5245 PT 50 0002 Weak or No Booster Assist Due to Vac Hose Problems All vehicles equipped with vacuum brake boosters Weak or no power assist Insufficient vacuum volume to operate booster at maximum efficiency Check vacuum draw available with a gauge connected between engine and booster At idle healthy engines draw somewhere between 17 and 22 in Hg Check vacuum by depressing brake pedal firmly until it stops The gauge should read a drop to approximately 10 in Hg and then quickly recover to a normal reading If vacuum takes too long to recover there is a restriction in the volume i e fitting clogged or vacuum hose collapsed Repair as necessary While a defective booster will cause a hard pedal a spongy or low pedal requires a hydraulic system check Application Problem Cause Solution Note