This vapor is introduced inside the intake manifold and a vacuum leak can be spotted visually by vapor coming out in the area of the leak. A smoke machine produces vapor that looks like smoke. Often, to find the source of a vacuum leak in the intake manifold, mechanics use a device called a smoke machine. Mechanics use a scan tool, special spray, a vacuum gauge and other testing equipment. Your local dealer can check for this type of information.ĭiagnosing vacuum leaks is not always easy. For example, Mazda offered Warranty Extension Program SSP 93 for the brake booster units in the 2007-2013 CX-9 models. Several manufacturers offered warranty extensions. There was also the recall P14 covering some 2011-2014 Dodge Durango and Jeep Grand Cherokee. FCA (Chrysler) issued the recall R63 for some Dodge Dart models. Several manufacturers have issued recalls or warranty extensions related to the brake booster. Symptoms of a leaking brake booster include a hissing noise coming from the brake pedal area and lack of brake assist.Ī leaking brake booster is a safety concern and must be replaced. When a brake booster leaks, it creates a vacuum leak. Inside the brake booster, there is a vacuum diaphragm.

Signs of automatic transmission problemsīrake booster is one of the possible sources of vacuum leaks.

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