Chevrolet Cobalt Service & Repair Manual: Emission Controls

Engine Management

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General Motors Co.

FIG. NO. BUICK: EVAP System & Canister: Centu ...

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Chevrolet Cobalt Service & Repair Manual. General Service
Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies, which use engine vacuum or in some cases vacuum pressure developed by an external vacuum pump. The second type is a hydraulic pressure assist mechanism, which use pressure developed by an ...