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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,162 Posts1,056,938 Members48,458 | | 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: Jul 2000 Posts: 2,200 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,200 | This shows how the "proportioning valve" should be plumbed. It's really a combination valve as it has the metering valve, brake warning light switch and proportioning valve all in one. https://www.carolinaclassictrucks.com/78-87-GM-FS-Truck-Prop-Valve.html
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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