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Click on image for the lowdown. 
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| | | Forums66 Topics128,013 Posts1,055,312 Members48,419 | | 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: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | To check the Hydrovac, push on the brake peddal with the truck OFF (do this when the engine has been off for a while so all vacuum is gone), then start it up. As the engine vacuum increases you should feel the brake peddal creep down a little...if it does then it's working.
Good luck ! | | |
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