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Click on image for the lowdown. 
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10 members (D B Cooper, Jims46, Hawkman, Southerntruck, klhansen, Otto Skorzeny, manymiles, MikeE, joe apple, 1 invisible),
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robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,049 Posts1,055,674 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | starkweatherr,
It's the little vent/breather for the atmosphere side of the hydrovac diaphragm. How about Quasimodo!
Stuart | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Even without looking at the pictures I say Stuart is right.
Hydrovac air cleaner
Grigg | | | | | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | Thanks. Makes perfect sense to me. I didn't notice one on the '51, but I don't have the seat out of it yet, either.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
| | | | | Joined: Jul 2006 Posts: 240 'Bolter | | 'Bolter Joined: Jul 2006 Posts: 240 | If that is working properly you should hear air going in and out of it. I had a guy come by the shop complaining of a hard brake pedal, what I found was the complete sleeve of a nylon wind breaker sucked down the tube, the cannister was MIA. Replaced the cannister and gave him his jacket back and all was good.
You Learn more Listening than Talking
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