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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2008 Posts: 3 New Guy | | New Guy Joined: Dec 2008 Posts: 3 | I have a 1944 CCKW 2.5 ton Army truck. The hydrovac appears to be a postwar retrofit. It is almost identical to the hydrovac article available on this website. The one thing the article doesn't mention is the order of the 3 big disks and the leather washer. In his article he didn't disassemble it. I did and forgot to take a picture. Can anyone tell me which order they go back together? Which way does the leather go?
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | rustednuts will have the best information for you; but, here is a 1946-54 diagram that might help. | | | | | Joined: Sep 2008 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 59 | This is a website I found for my Dodge but they used a hydrovac as well. http://www.dodgepilothouseclub.org/know/manual/manual.htmClick on general truck manuals, vacuum brakes, it is a 18meg download with 3 variations on the hydrovac and overhaul sequence. Ryan | | | | | Joined: Dec 2008 Posts: 3 New Guy | | New Guy Joined: Dec 2008 Posts: 3 | What oil or grease is recommended on these hydrovacs? When I disassembled it, there was a very thick layer of very black, but fresh looking grease, on the cylinder wall on the opposite side of the big spring. Should I apply more grease when I reassemble it?
Neil | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | I can email you a few pictures out the rebuild manual. Shoot me an email an Ill get them off to you. [email protected]As far as lubricating them, I used mineral oil on mine. You dont want to use anything that has a direct petroleum base. You could also use a thin synthetic, like a corn based oil. Youll want to avoid any thick oils. Jeff | | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | I have seen many recommendations that say to use air tool oil. | | |
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