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09-10-2018, 06:12 PM
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#1 |
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Registered User
Join Date: Mar 2013
Location: Sringfield MO
Posts: 34
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Drum proportion valve
Doing a disc conversion with an Astro van booster on a 70 C20. Question is can I used my old drum/drum proportion valve or switch over to a disc/drum one. Previous owner ran new brake lines and was seeing if I could keep them. Thanks
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09-10-2018, 06:37 PM
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#2 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,715
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Re: Drum proportion valve
Technically the drum block is a distribution block and not a proportioning block aka Combination Valve. You need a combination valve for the disc brake setup.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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09-10-2018, 06:49 PM
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#3 |
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Registered User
Join Date: Mar 2013
Location: Sringfield MO
Posts: 34
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Re: Drum proportion valve
I snag a proportion valve off an old g van since they seem to go unmolested in pick n pull yards.
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09-10-2018, 07:54 PM
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#4 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,170
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Re: Drum proportion valve
What master cylinder do you intend to use?
Suggest you get a true disk / drum style master as drum/drum has line valves in the ports to keep a small amount of line pressure in lines to keep rubber cups out against wheel cylinder bodies... Disk calipers can bind up if the valves are not removed from drum / drum masters... Much better to use disk/drum system and correct proportioning valve... 
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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09-10-2018, 08:14 PM
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#5 | |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,269
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Re: Drum proportion valve
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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09-10-2018, 08:58 PM
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#6 |
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Registered User
Join Date: Mar 2013
Location: Sringfield MO
Posts: 34
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Re: Drum proportion valve
I have a new MC for a 73+ 3/4. My setup looks like this. I thought the Astro van booster was what a lot of folks was running?
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09-10-2018, 09:31 PM
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#7 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Drum proportion valve
Hydroboost from an Astro is fine.
I have one installed on my Suburban
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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