 Maintenance Record
Maintenance Record Customer Satisfaction Procedure
Customer Satisfaction ProcedureChevrolet 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  ...