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#1 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Proportioning Valve Button Stuck?
I have attached a picture of my proportioning valve button and am not sure if it is stuck in a depressed state. If it is stuck how do I getting it un-stuck?
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#2 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: Proportioning Valve Button Stuck?
Having a stuck proportioning valve is actually very common
You have 2 choices - one is to tear it down and clean it out - you may find it so pitted inside that it is no longer usable second choice is to buy a new unit from POL or CPP I ended up buying a Wilwood after tearing into mine 2 or 3 times and it still would give me fits. The Wilwoods are adjustable for front to back bias but you do loose you idiot light plug in
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1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
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#3 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Proportioning Valve Button Stuck?
whats the button do anyway?
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#4 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: Proportioning Valve Button Stuck?
Good information. Thanks.
Would this be the valve you purchased? http://www.summitracing.com/parts/WI...1179/?rtype=10 Did you need to change any of the existing line fittings to hook up the new valve? Last edited by Alex Hayley; 08-21-2010 at 01:27 PM. |
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#5 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Proportioning Valve Button Stuck?
Can someone explain how the adj. vavles work, how do you know how to adjust it to what you need lol?
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#6 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,439
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Re: Proportioning Valve Button Stuck?
You guys are talking about two different kinds of valves.
The stock valve is two or more valves combined into one unit and for that reason it is called a combination valve. A combination valve includes a proportioning valve, but the part of the combination valve that includes that button is called a metering valve. A metering valve prevents fluid from flowing to the front disc brakes until the fluid flowing to the rear brakes reaches at least 40 psi. It is sometimes called an anti-dive valve. It makes the rear brakes begin to work before the front when you have light pedal pressure so the car doesn't do a nose dive.
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'67 GMC 2500, 292, 4spd, AC |
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#7 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: Proportioning Valve Button Stuck?
I would have to look at mine to tell you if it identical but it is close.
The set up is really simple - install the valve - yes you will need to fabricate parts of a new line to adapt it into your system - I actually tool the factory mounting bracket and mounted the proportioning valve on one side and a line lock on the other. After the valve is installed take you truck for a drive - jam on the brakes extra hard - if the rear wheels lock up turn the knob to reduce rear bias, if the rear tires do not lock up keep turning the bias up until you get the lock up and than turn the knob the other way to reduce bias
__________________
1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
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#8 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,439
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Re: Proportioning Valve Button Stuck?
This is the typical GM combination valve. Proportion valves do not do anything until the pressure reaches a couple of hundred pounds. If you have one that begins to work at 200 psi, then when you have 200psi on the front brakes, you will have 200psi on the rears. At 300psi to the front you may get 280psi to the rear. At 1000psi to the front, you may get 700psi at the rear. The harder you press on the pedal, you get proportionally less pressure on the rear brakes than you do the fronts. Hence the name proportion valve.
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'67 GMC 2500, 292, 4spd, AC |
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#9 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Proportioning Valve Button Stuck?
so if i decided id replace my 40 year old unit, would an adj. prop. vavle be a better idea? I think summits cheaper than places like ece ccp etc
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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