Brake Switch ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

daveo68 · 02-07-2008, 08:11 AM

I just put front disc brakes on my truck and was wondering how to hook up the switch that goes to the proportional valve. Also where is the switch that makes brake warning light come on in the dash panel for standard drum brakes?
Thanks,
Dave

bob1967 · 02-07-2008, 08:47 AM

I think, could be wrong, the wire on the proportional valve goes to a low brake fluid light. The brake light switch on my 67 is right behind the peddle, pain in the a$$ to get to

**VetteVet** · 02-07-2008, 09:05 AM

Quote:

Originally Posted by daveo68

I just put front disc brakes on my truck and was wondering how to hook up the switch that goes to the proportional valve. Also where is the switch that makes brake lights come on in the dash panel for standard drum brakes?
Thanks,
Dave

The switch you refer to is built into the p-valve and is operated by hydraulic pressure and springs inside the valve. The tan wire in the picture below hooks to the p-valve switch and runs to the brake warning light in the dash.
If you did not use a newer disc brake master cylinder and p-valve you may not get enough fluid volume to the front brakes and the rears may lock up before the fronts.

daveo68 · 02-07-2008, 09:12 AM

I have the newer m/c and prop valve.Doe's that tan wire run to the top of the new prop valve, or is there another part I need?
Thanks

daveo68 · 02-07-2008, 07:14 PM

Ttt

sneakysnake · 02-07-2008, 11:31 PM

The tan wire that was hooked to your old prop valve should be hooked to the new one.and the rear brake light switch is on the pedal under the dash

daveo68 · 02-08-2008, 02:47 AM

I found the wire, it was under the wiring gutter on firewall.Where can I get the connector and pigtail that plugs into the newer type prop valve for brake warning light?

daveo68 · 02-09-2008, 12:28 AM

Any board vendors have or know if you can get the connector and pigtail that plugs into the newer type prop valve for brake warning light?
Thanks
Dave

sneakysnake · 02-09-2008, 01:36 AM

Junkyard would have one,Or I think this will work.
http://www.performanceonline.com/sto...cat=665&page=2

daveo68 · 02-09-2008, 06:28 AM

Just got back from the junkyard and got two for $5.00. The one from Performance Online is the same except the two I got are 90 degree at the top.
Thanks for all the help everyone,
Dave

02-07-2008, 08:11 AM	#1
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Brake Switch ? I just put front disc brakes on my truck and was wondering how to hook up the switch that goes to the proportional valve. Also where is the switch that makes brake warning light come on in the dash panel for standard drum brakes? Thanks, Dave __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America Last edited by daveo68; 02-08-2008 at 04:55 AM.

02-07-2008, 08:47 AM	#2
bob1967 Registered User Join Date: Nov 2007 Location: peaster, texas Posts: 71	Re: Brake Switch ? I think, could be wrong, the wire on the proportional valve goes to a low brake fluid light. The brake light switch on my 67 is right behind the peddle, pain in the a$$ to get to

02-07-2008, 09:12 AM	#4
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Re: Brake Switch ? I have the newer m/c and prop valve.Doe's that tan wire run to the top of the new prop valve, or is there another part I need? Thanks __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America Last edited by daveo68; 02-07-2008 at 07:14 PM.

02-07-2008, 07:14 PM	#5
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Re: Brake Switch ? Ttt __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America

02-07-2008, 11:31 PM	#6
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: Brake Switch ? The tan wire that was hooked to your old prop valve should be hooked to the new one.and the rear brake light switch is on the pedal under the dash

02-08-2008, 02:47 AM	#7
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Re: Brake Switch ? I found the wire, it was under the wiring gutter on firewall.Where can I get the connector and pigtail that plugs into the newer type prop valve for brake warning light? __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America Last edited by daveo68; 02-08-2008 at 09:50 PM.

02-09-2008, 12:28 AM	#8
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Re: Brake Switch ? Any board vendors have or know if you can get the connector and pigtail that plugs into the newer type prop valve for brake warning light? Thanks Dave __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America

02-09-2008, 01:36 AM	#9
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: Brake Switch ? Junkyard would have one,Or I think this will work. http://www.performanceonline.com/sto...cat=665&page=2

02-09-2008, 06:28 AM	#10
daveo68 Senior Member Join Date: Dec 2001 Location: Lexington,NC Posts: 503	Re: Brake Switch ? Just got back from the junkyard and got two for $5.00. The one from Performance Online is the same except the two I got are 90 degree at the top. Thanks for all the help everyone, Dave __________________ 68 C-10 Custom LWB 307 V8 Lexington,NC davideowens@lexcominc.net God Bless America



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