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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,030 Posts1,055,424 Members48,422 | | 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 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | You can run both as they provide different functions.
The residual valves you already know about,whereas the proportioning valve provides balance between the front and rear circuits.
Due to the lighter rear end on most pick-ups when empty it's much easier to lock up the brakes in an emergency stop.
The proportioning valve (usually) reduces the pressure to the rears to prevent this.
There are adjustable ones available to allow you to tune your system to your personal needs.
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
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