Brake/ proportion valve question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Twiztid_66c10 · 11-14-2012, 02:29 PM

I have searched and can't really find a answer

I have a 66 c-10 with stock brakes. I replaced the stock crossmember with a sectioned one and messed up some brakes lines so decided just to up grade to the 67 dual chamber master cylinder. I want to run all the lines since I have the motor out. My question is I know right now I do not need a proportion valve but down the road I want to install drop spindles with disk non power brakes and I will need a valve. I would like to just install a valve now since I have room to work in there with motor out. Questions I have now are is it safe to run the valve with drum/drum brakes and if so witch one I need?
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1963c-10 · 11-14-2012, 04:26 PM

I dont know if its safe, but its not needed until you put disk brakes on the front. I have seen distribution blocks on drum/drum, but I dont know that Ive ever seen a proportioning valve on a drum/drum truck. They are not that hard to install...I would hold off until you hav edone the front end conversion.

Twiztid_66c10 · 11-14-2012, 05:00 PM

my theory was just that i see them mounted on the frame and dont want to have to cut my brake lines and redo the fittings and re flare ends when i can just do it all right now tieh the engine bay clear

Twiztid_66c10 · 11-14-2012, 05:13 PM

well seems i have answered my own answer doing further research i was thinking a dist box not a portion box.

62-One-Ton · 11-14-2012, 07:50 PM

You could intall a proportioning valve and leave it all the way open...
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**jocko** · 11-14-2012, 08:12 PM

do not install a prop valve or distr block with a stock 67 dual res master cyl that you've used to upgrade you 66 with. That master cylinder has built in proportioning for a drum/drum system. It's a great swap but prop valve not to be used for just that swap. Once you go disk/drum or disk/disk - a prop valve will be necessary.

here's a thread with some more details: http://67-72chevytrucks.com/vboard/s...d.php?t=332148 (chief rocka's great thread) and http://67-72chevytrucks.com/vboard/s...d.php?t=487384 (i did exactlywhat you did in my old 66, here's the thread)

Twiztid_66c10 · 11-15-2012, 02:23 AM

So when I do change to disk I will need to change the mc to a disk/drum and a proportion valve or just a valve
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**Captainfab** · 11-16-2012, 12:12 AM

You will need to change to a disc/drum master cylinder and add a disc/drum proportioning valve.

11-14-2012, 02:29 PM	#1
Twiztid_66c10 Registered User Join Date: Feb 2010 Location: The Dalles Oregon Posts: 191	Brake/ proportion valve question I have searched and can't really find a answer I have a 66 c-10 with stock brakes. I replaced the stock crossmember with a sectioned one and messed up some brakes lines so decided just to up grade to the 67 dual chamber master cylinder. I want to run all the lines since I have the motor out. My question is I know right now I do not need a proportion valve but down the road I want to install drop spindles with disk non power brakes and I will need a valve. I would like to just install a valve now since I have room to work in there with motor out. Questions I have now are is it safe to run the valve with drum/drum brakes and if so witch one I need? Posted via Mobile Device __________________ 1966 C-10 long wide- currently with 2 3/4 sectioned crossmember, 3 inch cupped a arms with 2700 bags, 67 master cylinder, in the middle of a v8 swap, soon custom rear wishbone set up and bags 1942 chevy/divco ambulance 1937 chevy truck

11-14-2012, 04:26 PM	#2
1963c-10 Registered User Join Date: Nov 2011 Location: fayetteville nc Posts: 10,338	Re: Brake/ proportion valve question I dont know if its safe, but its not needed until you put disk brakes on the front. I have seen distribution blocks on drum/drum, but I dont know that Ive ever seen a proportioning valve on a drum/drum truck. They are not that hard to install...I would hold off until you hav edone the front end conversion. __________________ 1963 Short bed step side SBW 427 big block and borg warner T-16 HD 3 speed manual http://67-72chevytrucks.com/vboard/s...d.php?t=519869 1963 Short bed fleetside BBW 348 1st gen big block w/Powerglide http://67-72chevytrucks.com/vboard/s...d.php?t=619024 1964 Short bed trailer

11-14-2012, 05:00 PM	#3
Twiztid_66c10 Registered User Join Date: Feb 2010 Location: The Dalles Oregon Posts: 191	Re: Brake/ proportion valve question my theory was just that i see them mounted on the frame and dont want to have to cut my brake lines and redo the fittings and re flare ends when i can just do it all right now tieh the engine bay clear __________________ 1966 C-10 long wide- currently with 2 3/4 sectioned crossmember, 3 inch cupped a arms with 2700 bags, 67 master cylinder, in the middle of a v8 swap, soon custom rear wishbone set up and bags 1942 chevy/divco ambulance 1937 chevy truck

11-14-2012, 05:13 PM	#4
Twiztid_66c10 Registered User Join Date: Feb 2010 Location: The Dalles Oregon Posts: 191	Re: Brake/ proportion valve question well seems i have answered my own answer doing further research i was thinking a dist box not a portion box. __________________ 1966 C-10 long wide- currently with 2 3/4 sectioned crossmember, 3 inch cupped a arms with 2700 bags, 67 master cylinder, in the middle of a v8 swap, soon custom rear wishbone set up and bags 1942 chevy/divco ambulance 1937 chevy truck

11-14-2012, 07:50 PM	#5
62-One-Ton Registered User Join Date: Feb 2012 Location: Rescue, CA Posts: 255	Re: Brake/ proportion valve question You could intall a proportioning valve and leave it all the way open... Posted via Mobile Device __________________ Project Change of Plans: http://67-72chevytrucks.com/vboard/s...d.php?t=513135 '62 C10 SWB '03 Express Van 5.3l Dead (parting out and using motor) '99 Silverado 4.8l 5 speed 4wd

11-14-2012, 08:12 PM	#6
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,984	Re: Brake/ proportion valve question do not install a prop valve or distr block with a stock 67 dual res master cyl that you've used to upgrade you 66 with. That master cylinder has built in proportioning for a drum/drum system. It's a great swap but prop valve not to be used for just that swap. Once you go disk/drum or disk/disk - a prop valve will be necessary. here's a thread with some more details: http://67-72chevytrucks.com/vboard/s...d.php?t=332148 (chief rocka's great thread) and http://67-72chevytrucks.com/vboard/s...d.php?t=487384 (i did exactlywhat you did in my old 66, here's the thread)

11-15-2012, 02:23 AM	#7
Twiztid_66c10 Registered User Join Date: Feb 2010 Location: The Dalles Oregon Posts: 191	Re: Brake/ proportion valve question So when I do change to disk I will need to change the mc to a disk/drum and a proportion valve or just a valve Posted via Mobile Device __________________ 1966 C-10 long wide- currently with 2 3/4 sectioned crossmember, 3 inch cupped a arms with 2700 bags, 67 master cylinder, in the middle of a v8 swap, soon custom rear wishbone set up and bags 1942 chevy/divco ambulance 1937 chevy truck

11-16-2012, 12:12 AM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Brake/ proportion valve question You will need to change to a disc/drum master cylinder and add a disc/drum proportioning valve. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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