Corvette proportioning valve

Pontiac Lee · 10-16-2007, 03:34 PM

I am replacing this valve on my 70 Corvette. It has an electrical connection on it. Can someone tell me what purpose it serves and where the wire leads. Thanks, Lee

Jeff Lee · 10-16-2007, 03:37 PM

Low brake pressure warning?

L79racer · 10-16-2007, 04:35 PM

That one wire would be the low brake light.

Pontiac Lee · 10-17-2007, 02:31 PM

Thanks L79 and Jeff for the info. I think the valve is stuck as I can't bleed the rear brakes. I tapped on it while putting pressure on it, but to no avail. I guess a new valve is in my future, eh? Thanks again. Lee B.

Harry 6674 · 10-17-2007, 04:39 PM

Some of them have a small (1/8in.) plunger that pops out that needs to be pushed in to reset.

Dave Goob Cook · 10-18-2007, 07:18 AM

Frequently, to re-set that valve once it goes off center, (that is how the indicator works) you MUST have that wire hooked up, ignition on, then bleed off the pressure from the side that has pressure, to re-center the valve.....why it only will re-set with power applied I'm not sure, not all of them require it, but it might.....
Anyway, you always have to work the system front/rear/front/rear to keep the valve centered.

The purpose of it is to cut off fluid flow to the side that lost pressure, like if a hose or tube burst.....

The valve is actually un-needed to proper brake operation, especially on a 50/50 brake system like the Corvette......easier to plumb around it if this isn't a restoration street car.

10-16-2007, 03:34 PM	#1
Pontiac Lee Junior Member Join Date: Sep 2007 Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Corvette proportioning valve I am replacing this valve on my 70 Corvette. It has an electrical connection on it. Can someone tell me what purpose it serves and where the wire leads. Thanks, Lee

10-16-2007, 03:37 PM	#2
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Corvette proportioning valve Low brake pressure warning? __________________ Jeff Lee 7494 D/S '70 AMX

10-16-2007, 04:35 PM	#3
L79racer Member Join Date: Jan 2005 Location: North Massapequa, NY Posts: 218 Likes: 0 Liked 0 Times in 0 Posts	Re: Corvette proportioning valve That one wire would be the low brake light.

10-17-2007, 02:31 PM	#4
Pontiac Lee Junior Member Join Date: Sep 2007 Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Re: Corvette proportioning valve Thanks L79 and Jeff for the info. I think the valve is stuck as I can't bleed the rear brakes. I tapped on it while putting pressure on it, but to no avail. I guess a new valve is in my future, eh? Thanks again. Lee B.

10-17-2007, 04:39 PM	#5
Harry 6674 Senior Member Join Date: Dec 2006 Posts: 589 Likes: 0 Liked 0 Times in 0 Posts	Re: Corvette proportioning valve Some of them have a small (1/8in.) plunger that pops out that needs to be pushed in to reset.

10-18-2007, 07:18 AM	#6
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: Corvette proportioning valve Frequently, to re-set that valve once it goes off center, (that is how the indicator works) you MUST have that wire hooked up, ignition on, then bleed off the pressure from the side that has pressure, to re-center the valve.....why it only will re-set with power applied I'm not sure, not all of them require it, but it might..... Anyway, you always have to work the system front/rear/front/rear to keep the valve centered. The purpose of it is to cut off fluid flow to the side that lost pressure, like if a hose or tube burst..... The valve is actually un-needed to proper brake operation, especially on a 50/50 brake system like the Corvette......easier to plumb around it if this isn't a restoration street car.