Wiring to Brake Proportioning Valve - Please Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lts70 · 11-29-2012, 12:12 AM

I updated my brake system to 4 wheel Disc and had to change out my proportioning valve.

1) The new valve has a two male conection point and the old wire only has one female conector. How should I wire this?

2) What is this conection even for?

bigbadchev72 · 11-29-2012, 12:14 AM

I believe that is a brake light swith on the new one

lts70 · 11-29-2012, 12:16 AM

What is my brown wire for? What should I do with it?

**Stocker** · 11-29-2012, 12:45 AM

That brown wire lights up the red "brake" warning light on your dash if the PV pin is off-center due to a problem..... not sure what all the conditions are, but very low fluid I think is one (pressure is no longer equal between front & rear).

lts70 · 11-29-2012, 12:53 AM

Can I still run that functionality with my new valve?

**Stocker** · 11-29-2012, 02:10 AM

Did the new valve come with any instructions? The old one worked by grounding the brown wire (when there's a problem) so you should be able to rig up the new one to do the same. You said it has two connectors -- must be an internal switch. First thing is to figure out if the switch is open or closed when normal. If it's normally open, run a ground to one pin, and connect the brown wire to the other pin. That way when there's a problem, the switch will close, grounding the brown wire and lighting the 'brake' light on the dash.

But if the switch is normally closed, it gets more complicated. You'd need to rig up a relay.

11-29-2012, 12:12 AM	#1
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,037	Wiring to Brake Proportioning Valve - Please Help I updated my brake system to 4 wheel Disc and had to change out my proportioning valve. 1) The new valve has a two male conection point and the old wire only has one female conector. How should I wire this? 2) What is this conection even for? Attached Images __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.

11-29-2012, 12:14 AM	#2
bigbadchev72 People know me Join Date: Jun 2007 Location: Hermiston, oregon Posts: 840	Re: Wiring to Brake Proportioning Valve - Please Help I believe that is a brake light swith on the new one __________________ 1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels

11-29-2012, 12:16 AM	#3
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,037	Re: Wiring to Brake Proportioning Valve - Please Help What is my brown wire for? What should I do with it? __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.

11-29-2012, 12:45 AM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,617	Re: Wiring to Brake Proportioning Valve - Please Help That brown wire lights up the red "brake" warning light on your dash if the PV pin is off-center due to a problem..... not sure what all the conditions are, but very low fluid I think is one (pressure is no longer equal between front & rear). __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

11-29-2012, 12:53 AM	#5
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,037	Re: Wiring to Brake Proportioning Valve - Please Help Can I still run that functionality with my new valve? __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.

11-29-2012, 02:10 AM	#6
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,617	Re: Wiring to Brake Proportioning Valve - Please Help Did the new valve come with any instructions? The old one worked by grounding the brown wire (when there's a problem) so you should be able to rig up the new one to do the same. You said it has two connectors -- must be an internal switch. First thing is to figure out if the switch is open or closed when normal. If it's normally open, run a ground to one pin, and connect the brown wire to the other pin. That way when there's a problem, the switch will close, grounding the brown wire and lighting the 'brake' light on the dash. But if the switch is normally closed, it gets more complicated. You'd need to rig up a relay. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay



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