Booster to proportioning valve (combo valve) line size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChadW · 05-31-2022, 02:27 PM

I am setting up my disc/drum master/booster/combo valve and am getting ready to make the lines that go to from my master to my proportioning valve...My valve is located in my frame rail so my lines from the booster to this valve are a little longer than most...the master has 2 different size ports, forward most port 1/2 and port closest to firewall is 9/16. The combo valve has 2 different size ports for the lines coming from the master as well...1/2 in front and 7/16 in rear on valve....Cpl questions i hope someone can straighten me out on....#1...line size, do i need 3/16 or 1/4 line going between master and combo valve? #2 does it hook up front to front , rear to rear or ?

**The Rocknrod** · 05-31-2022, 05:07 PM

Here's some good info with very good pictures - http://67-72chevytrucks.com/vboard/s...d.php?t=616493

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05-31-2022, 02:27 PM	#1
ChadW Registered User Join Date: Jan 2018 Location: Danville, IL Posts: 160	Booster to proportioning valve (combo valve) line size I am setting up my disc/drum master/booster/combo valve and am getting ready to make the lines that go to from my master to my proportioning valve...My valve is located in my frame rail so my lines from the booster to this valve are a little longer than most...the master has 2 different size ports, forward most port 1/2 and port closest to firewall is 9/16. The combo valve has 2 different size ports for the lines coming from the master as well...1/2 in front and 7/16 in rear on valve....Cpl questions i hope someone can straighten me out on....#1...line size, do i need 3/16 or 1/4 line going between master and combo valve? #2 does it hook up front to front , rear to rear or ?

05-31-2022, 05:07 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Booster to proportioning valve (combo valve) line size Here's some good info with very good pictures - http://67-72chevytrucks.com/vboard/s...d.php?t=616493 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?



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