Proportioning Valve Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dick Dale · 11-30-2004, 06:14 PM

Today must be brake day or something. I need a new prop. valve and the old one is discontinued. What do I buy and how do I hook up the brake light wire on the new one. Thanks.

chickenwing · 11-30-2004, 06:22 PM

What exactly is it for?

68w/sbc406 · 11-30-2004, 11:11 PM

mothertruckers has them. i know that for sure. new and used

68speedalert · 12-01-2004, 03:21 AM

How do you know you need one?

A Prop valve does more than one thing. It delays the front disc from applying compared to the rears. 4 wheel drum Prop valves don't.

Second function is in case of a catastrophic failure in the front or rear circuits, a block inside slides and blocks the fluid from continuing out the bad line. It then sets the 'brake' light on telling the driver there is a problem. (like he won't know from his foot going to the floor).

Dick Dale · 12-01-2004, 04:02 PM

The PO left the brakes a mess and I decided since it doesnt run yet, to change all the brake components before the engine this summer.

71Chev · 12-01-2004, 08:16 PM

You'll find a replacement here. If you are staying with stock brakes, you need the disc/drum prop valve. Brake warning light wire hooks up just like yours does now.
http://www.gmcpauls.com/Brakes&Steering.htm

11-30-2004, 06:14 PM	#1
Dick Dale Excelsior, You Fathead. Join Date: Jun 2004 Location: Valparaiso, In Posts: 937	Proportioning Valve Question Today must be brake day or something. I need a new prop. valve and the old one is discontinued. What do I buy and how do I hook up the brake light wire on the new one. Thanks. __________________ Go Navy. The Sea Is Ours. Budget 350 Build http://67-72chevytrucks.com/vboard/s...38#post2264638

11-30-2004, 06:22 PM	#2
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	What exactly is it for? __________________ The truck... you hear that? No really, you did hear that?!!!

11-30-2004, 11:11 PM	#3
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	mothertruckers has them. i know that for sure. new and used __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

12-01-2004, 03:21 AM	#4
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	How do you know you need one? A Prop valve does more than one thing. It delays the front disc from applying compared to the rears. 4 wheel drum Prop valves don't. Second function is in case of a catastrophic failure in the front or rear circuits, a block inside slides and blocks the fluid from continuing out the bad line. It then sets the 'brake' light on telling the driver there is a problem. (like he won't know from his foot going to the floor). __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

12-01-2004, 04:02 PM	#5
Dick Dale Excelsior, You Fathead. Join Date: Jun 2004 Location: Valparaiso, In Posts: 937	The PO left the brakes a mess and I decided since it doesnt run yet, to change all the brake components before the engine this summer. __________________ Go Navy. The Sea Is Ours. Budget 350 Build http://67-72chevytrucks.com/vboard/s...38#post2264638

12-01-2004, 08:16 PM	#6
71Chev Senior Member Join Date: Dec 2000 Location: Indiana Posts: 3,074	You'll find a replacement here. If you are staying with stock brakes, you need the disc/drum prop valve. Brake warning light wire hooks up just like yours does now. http://www.gmcpauls.com/Brakes&Steering.htm __________________ 71 Chevy CST Long Fleet 350/350/3.07 leaf rear.



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