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| | Forums66 Topics128,052 Posts1,055,725 Members48,426 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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| | | Joined: Mar 2013 Posts: 235 Shop Shark | | Shop Shark Joined: Mar 2013 Posts: 235 | There are two components under the seat that I cannot easily locate in the Service Manual. One seems to be an oil filter or booster pump. The other seems to be related to the vacuum system as it comes from the manifold. Anyone with knowledge of what these are? Components under seat Vacuum booster ? under cab | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Bob, Take these guesses with grain of salt. I have a 1954 GMC COE and there are a variety of differences in comparison to 1954 Chevrolet COEs. I'd bet the canister in the foreground of the first photo is an oil filter. See if you can trace/track the lines to the block. The second photo looks like a hydrovac unit for the brake system. If it is, it should have a large vacuum line and a brake line attached to it. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | brake hydrovac unit under the floor, under the seat bits are probably parts of it
Bill | | | | | Joined: Jan 2013 Posts: 603 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 603 | The part with the line attached sorta looks like the air intake filter for the hydrovac booster. My 59 GMC has one similar to that mounted on the right firewall. If it is, it will have a dry paper filter inside.
The other object looks like a breather cap of some sort.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket | | | | | Joined: Mar 2013 Posts: 235 Shop Shark | | Shop Shark Joined: Mar 2013 Posts: 235 | Thanks all
One is definitely a hydrovac brake unit. I'll pull that out and start cleaning it. OldGMCGold properly identified the breather cap that comes up under the seat.
The other sure seems to be an oil filter of some sort. It has tubes that go in and out of the bottom of the engine block. | | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | | | | | | Joined: Mar 2013 Posts: 235 Shop Shark | | Shop Shark Joined: Mar 2013 Posts: 235 | Fantastic - thanks Brad.
I sure hope I don't need any replacement parts. I bet those are going to be hard to find. | | | | | Joined: Mar 2013 Posts: 235 Shop Shark | | Shop Shark Joined: Mar 2013 Posts: 235 | Brad Any way you can send me the Hydrovac filmstrip as a PDF? I like to save that kind of stuff in a digital file and can't figure out how to do that through Flickr. [email protected]No worries if you can't. Thanks again | | |
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