proportioning valve reset - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Solver · 08-23-2006, 11:15 PM

Lost pressure on rear line and it drained the front reservoir on master .
Brake light came on so I know the prop valve is working. How can I reset the proportioning valve to allow fluid to back lines again?

**Stocker** · 08-23-2006, 11:35 PM

Maybe this will help...

http://www.classicperform.com/TechBo...t.htm#testprop

71/454 · 08-24-2006, 12:38 AM

First try fixing the leak and tightening all the bleed valves add the fluid and pump the ever lovin beeswax outa the pedal and let it sit for a while probably a couple hours and then vacum bleed from the furthest point from the master working towards it. Had the same problem on a 90 with rabs my mechanic friend suggested this and it worked. hope it helps

jacobs · 08-24-2006, 07:23 AM

If the prop. valve is working properly, and everything else is ok, they will automatically reset by pressing on the brake pedal. Now Ford's are a different story.

molnar55 · 08-24-2006, 08:12 AM

remove the brake pressure switch. look in the hole and you will see a small rod. there should be a groove in the rod. most likely it has moved either front to back. take a small pick and move the rod to the center position and reinstall the switch.

08-23-2006, 11:15 PM	#1
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	proportioning valve reset Lost pressure on rear line and it drained the front reservoir on master . Brake light came on so I know the prop valve is working. How can I reset the proportioning valve to allow fluid to back lines again? __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

08-23-2006, 11:35 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,692	Re: proportioning valve reset Maybe this will help... http://www.classicperform.com/TechBo...t.htm#testprop __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

08-24-2006, 12:38 AM	#3
71/454 Turbo Guy Join Date: Jan 2005 Location: Calgary Alberta Posts: 353	Re: proportioning valve reset First try fixing the leak and tightening all the bleed valves add the fluid and pump the ever lovin beeswax outa the pedal and let it sit for a while probably a couple hours and then vacum bleed from the furthest point from the master working towards it. Had the same problem on a 90 with rabs my mechanic friend suggested this and it worked. hope it helps __________________ 1972 Gmc Custom swb intercooled twin turbo 327 10.5-1 and 12 lbs of boost, Nodular iron case super t-10 4 speed with a blowproof bellhousing, 12 bolt eaton posi soon to have moser axles. 1998 Honda CR250 fully ported, case matched, milled head, vortexed carb and revalved suspension but don't forget the woody woodpecker decal kit! Things I've broken so far: 12 bolt diff saginaw 4 spd many, many pieces Aluminum case Super t-10 4 spd

08-24-2006, 07:23 AM	#4
jacobs Registered User Join Date: Sep 2005 Location: 9000' Mountain Man Posts: 326	Re: proportioning valve reset If the prop. valve is working properly, and everything else is ok, they will automatically reset by pressing on the brake pedal. Now Ford's are a different story.

08-24-2006, 08:12 AM	#5
molnar55 Junior Member Join Date: Feb 2006 Location: Midlothian virginia Posts: 57	Re: proportioning valve reset remove the brake pressure switch. look in the hole and you will see a small rod. there should be a groove in the rod. most likely it has moved either front to back. take a small pick and move the rod to the center position and reinstall the switch. __________________ 1967 C-10 6ft Fleet 1972 C-10 6ft Fleet 1955 Belair 2dr post 1984 C-10 6ft Fleet 1999 Chevy Tahoe Click Here For Our Online Store: http://estore.websitepros.com/1269809/StoreFront.bok Home Page: http://www.bumpandgrindgarage.com



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