Quote:
	
	
		
			
				
					Originally Posted by  clickman
					 
				 
				Replace how regularly? 
			
		 | 
	
	
 
We pressure test them every time a car comes into the shop; if they don't hold until 18.2 PSIG, they go in the trash.  Never tried to develop an "average life expectancy", as it seems to be all over the map.  If you can't pressure test, I would replace it at least every two years.