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Click on image for the lowdown. 
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| | | Forums66 Topics128,076 Posts1,056,008 Members48,433 | | 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!
| | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | MB, The easy way to check if the Hydrovac is working is with the truck off depress the brake pedal with medium pressure. While holding the brake start the truck...if the Hydrovac is working you will feel the brake pedal fade away a little bit. Take care, Mike B  | | |
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