Question about GMC Sonoma
The booster diaphram has probably failed. Check to see if the vacuum line to the booster is still holding vacuum when the car is turned off. Also check the other end of the hose to make sure it is not leaking where it attaches to the engine intake manifold. With the engine running, stick your head under the dash and press the brake with your hand. Listen for an air leak in the booster, which is in front of the brake pedal, in the engine compartment. If the booster is getting vacuum, but is not boosting, replace the booster. Let us know if you need the procedure or if you have other questions.
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
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