stock or adjustable proportioning valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

taser · 02-27-2004, 02:23 AM

i recently switched over to discs up front on my 70 blazer, so... i have to get a proportioning valve sometime, but should i go with the stock or an adjustable - I plan on switching the rear to discs as well ---todd

Longhorn Man · 02-27-2004, 02:48 AM

get an adjustable one if you are going to mess wioth the rear.
Something as seemingly harmless, like installing bigger rear tires can throw a well ballanced system out of whack.

Hotrod70C10 · 02-27-2004, 03:32 AM

I wouldn't drive it too much without an disc/drum prop valve or an adjustable one. You'll go through the rear shoes pretty quickly. Don't ask me how I know that.

MOTHERTRUCKERS · 02-27-2004, 09:29 AM

adj 45.00 stock 69.00 adjustable works with every combination, stock works with stock.

67dragtruck · 02-27-2004, 09:52 AM

I run a Dodge Caravan aluminum master cylinder and don't think that I need a pro. valve at all. I have a Summit adjustable one installed on the rear with it turned up all the way and don't see the point of it being there. Isn't the point to be able to adjust if one locks up before the other so you can get max braking. I was told I needed one on the rear because "with the light back end of a pickup it will lockup the rear brakes easily" maybe with the stock wheels and tires on it. I never had that trouble when I had normal size radials front and rear either. Maybe I'm just lucky and the Caravan M.C. just works well.

Tom

taser · 02-27-2004, 08:10 PM

thx all, i think i will go w/ the adjustable...which one is best and where is the best place to get it? I have a summit magazine, don't know if they have them though... thx for the info - todd

neonlarry · 02-27-2004, 08:25 PM

From the above post it looks like Mothertruckers has them. Buy them from a board member.

taser · 02-27-2004, 09:17 PM

would a combination/proportioning/metering etc combo work better like this one? http://www.hotrodssuperstore.com/compropval.html

MOTHERTRUCKERS · 02-27-2004, 10:07 PM

They are stock combo/prop valves in a cleaned up housing for show cars. stock prop valves do the same thing they do only uglier, the MB-VL3350k has the same features as a 71-72 stock valve but 80.00 more.

photoglg · 02-28-2004, 06:52 PM

I went with the combination valve on my 69. I put the front disks on last week and it works like a dream no lockups. The comb has a metering valve, Pressure valve and Proportioning valve combined. The metering valve keeps the front disks from locking up at low speed and the proportioning keeps the rears from locking up at high speed.
I have have a wilwood manual I bought and did not use you can have it for $20. if you want

veltex · 03-10-2004, 10:33 PM

photo, if the wilwood adjustable is (new)never used, I'll give you $20 for it, let me know, thanks

02-27-2004, 02:23 AM	#1
taser Registered User Join Date: Sep 2003 Location: albuqueque Posts: 105	stock or adjustable proportioning valve i recently switched over to discs up front on my 70 blazer, so... i have to get a proportioning valve sometime, but should i go with the stock or an adjustable - I plan on switching the rear to discs as well ---todd

02-27-2004, 03:32 AM	#3
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	I wouldn't drive it too much without an disc/drum prop valve or an adjustable one. You'll go through the rear shoes pretty quickly. Don't ask me how I know that. __________________ 70' C-10 LWB Fleetside 4.5/6 drop

02-27-2004, 09:29 AM	#4
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	adj 45.00 stock 69.00 adjustable works with every combination, stock works with stock. __________________ Rest in Peace Ed. Thanks for all the good times.

02-27-2004, 09:52 AM	#5
67dragtruck Registered User Join Date: May 2001 Location: Bethlehem, GA, USA Posts: 389	prop. valve I run a Dodge Caravan aluminum master cylinder and don't think that I need a pro. valve at all. I have a Summit adjustable one installed on the rear with it turned up all the way and don't see the point of it being there. Isn't the point to be able to adjust if one locks up before the other so you can get max braking. I was told I needed one on the rear because "with the light back end of a pickup it will lockup the rear brakes easily" maybe with the stock wheels and tires on it. I never had that trouble when I had normal size radials front and rear either. Maybe I'm just lucky and the Caravan M.C. just works well. Tom __________________ No more dragtruck for me. I'm building a new ride though. It's a '71 fleetside, 400 sbc, 700R4. Working on it now, finally. Soon to have Edelbrock Pro Flo EFI, Vintage Air, 1 piece windows, buddy buckets, etc. My new build thread: http://67-72chevytrucks.com/vboard/s...17#post2861817 Best pass with the old dragtruck: 5.32 @ 131.6 mph 1/8 mile w/ a 1.25 60' Fogger/Plate 2003 Best pass with the street 406 hydraulic roller motor w/ mild plate tuneup 5.93 @ 114 mph 1/8 mile w/ a 1.29 60' 2003 or 2004

02-27-2004, 08:10 PM	#6
taser Registered User Join Date: Sep 2003 Location: albuqueque Posts: 105	thx all, i think i will go w/ the adjustable...which one is best and where is the best place to get it? I have a summit magazine, don't know if they have them though... thx for the info - todd __________________ 71 blazer 700r4 350 edelbrock cam, 1407 carb, holley intake, hei accel dist

02-27-2004, 02:48 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	get an adjustable one if you are going to mess wioth the rear. Something as seemingly harmless, like installing bigger rear tires can throw a well ballanced system out of whack.

02-27-2004, 08:25 PM	#7
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	From the above post it looks like Mothertruckers has them. Buy them from a board member. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

02-27-2004, 09:17 PM	#8
taser Registered User Join Date: Sep 2003 Location: albuqueque Posts: 105	would a combination/proportioning/metering etc combo work better like this one? http://www.hotrodssuperstore.com/compropval.html __________________ 71 blazer 700r4 350 edelbrock cam, 1407 carb, holley intake, hei accel dist

02-27-2004, 10:07 PM	#9
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	They are stock combo/prop valves in a cleaned up housing for show cars. stock prop valves do the same thing they do only uglier, the MB-VL3350k has the same features as a 71-72 stock valve but 80.00 more. __________________ Rest in Peace Ed. Thanks for all the good times.

02-28-2004, 06:52 PM	#10
photoglg Registered User Join Date: Jul 2001 Location: Oxnard, CA Posts: 143	I went with the combination valve on my 69. I put the front disks on last week and it works like a dream no lockups. The comb has a metering valve, Pressure valve and Proportioning valve combined. The metering valve keeps the front disks from locking up at low speed and the proportioning keeps the rears from locking up at high speed. I have have a wilwood manual I bought and did not use you can have it for $20. if you want Attached Images __________________ 1969 GMC S/B S/S 3" drop

03-10-2004, 10:33 PM	#11
veltex Registered User Join Date: Oct 2003 Location: Idaho Posts: 257	photo, if the wilwood adjustable is (new)never used, I'll give you $20 for it, let me know, thanks __________________ beater 65 gmc at the moment



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