Brake boost vacuum system mechanical failure11/12/2022 ![]() ![]() ![]() Per the case, the brake vacuum pump issue is caused by debris in engine oil and/or oil sludge that clogs the oil inlet screen on the vacuum pump. Moreover, because the vacuum pump is mounted on a vehicle’s overhead exhaust-side camshaft, which enables an engine to function by opening its valves in time with the crankshaft, its failure may produce unintended mechanical resistance and affect ignition timing and/or damage the camshaft and other critical engine parts, the complaint states. In the Chevy Malibu models at issue, however, an apparent defect can cause the brake booster vacuum pump to fail internally, which can in turn result in hard brake pedal application, reduced braking capability and increased stopping distances, the lawsuit claims. The brake boosters require a steady vacuum supply to increase the forces that the driver applies to a vehicle’s brake pedal, and the cam-driven vacuum pump supplies the brake booster with the requisite vacuum, the lawsuit states. The 85-page case says that the cam-driven brake vacuum pump in affected Chevy Malibu models uses a brake booster to “amplify” brake pedal application. Although PCV failure is most common on the 1.8T engines equipped with the auxiliary vacuum pump, any engine with low vacuum can cause that electric pump to run excessively - resulting in this fault code.New to ? Read our Newswire DisclaimerĪ proposed class action alleges 2013-2022 Chevy Malibu models are plagued by a brake vacuum pump defect that can cause a driver to lose the ability to brake, as well as damage engine components. When this fault is stored in conjunction with misfire and system lean fault codes check the PCV system and any other possible sources of engine mechanical vacuum leaks. If needed activate basic settings using and pump the brake pedal. Group 008 is commonly the self test for this system and may be activated Key On, Engine Off. The blade wheel (rotor) in the vacuum pump is stuckĬheck if the blade wheel (rotor) of the vacuum pump is stuck, otherwise the fuse will burn againĬheck Hoses from/to Brake Boost Vacuum Pump Hoses from/to Brake Boost Vacuum Pump faulty If the blade wheel (rotor) in the vacuum pump is stuck, most probably a fuse will burn 17887/ P1479/005241 - Brake Boost Vacuum System: Mechanical Failure ![]()
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