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| Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. | 
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			#1  
			
			
			
			
			
		 
		
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			How exactly does it feel when a slave cylinder finally goes out? Is the clutch/brake system all that complicated?  
		
		
		
		
		
		
			My clutch goes to the floor and stays there, but the reservoir is full. I know my slave cylinder is leaky (ordered a replacement already) but even leaky it still worked as long as I kept the tank full. Is there another thing that goes out on these things pretty often that I should check while I'm in there?  
		
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			#2  
			
			
			
			
			
		 
		
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			Fetch, When the slave cylinder fails, the clutch won't release anymore. Your small leak probably just became a big leak and drew air into the system which means no more hydraulics to work the clutch. Check the line from the master cylinder to the slave cylinder. It has a rubber section which can also leak. Inline Tube sells a replacement line for $45 or you might have one made locally. 
		
		
		
		
		
		
		
		
	
	These trucks are not complicated compared to new ones. Of course when you add years of caked on grease, rusty bolts & nuts, wasps & mud daubers etc. things can get a little challenging. An original GMC service manual is worth the money too.  | 
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			#3  
			
			
			
			
			
		 
		
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			Air in the line was exactly what it was, thanks Snazzy! After a couple of days of having a full master cylinder gravity did its thing and my clutch works again!  
		
		
		
		
		
		
			I have a replacement slave cylinder on the way. 
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