Weak Or No Booster Assist Due To Vac Hose Problems

Weak Or No Booster Assist Due To Vac Hose Problems

When power assist ability is weak or non-existent, there could be a deficiency in vacuum volume to operate the booster at its highest level.

0-vacuum booster tech tipCondition

Weak or no power assist.


Insufficient vacuum volume to operate booster at maximum efficiency.

Repair Procedure

Check vacuum draw available with a gauge connected between engine and booster. At idle, healthy engines draw somewhere between 17 and 22 inHg.

Check vacuum by depressing brake pedal firmly until it stops. The gauge should read a drop to approximately 10 inHg 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.

Courtesy of CARDONE ProTech

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