Does anyone know what that single wire coming out of the top of the proportioning valve is for. Where does it go, to constant 12V? And what does it do?

 

It's a ground for the brake failure light. As well as controlling brake proportioning, you have a shuttle valve in the middle. Normally this is balanced by hydraulic pressure on both sides of the valve. If you have a hydraulic failure in either the front or rear circuit ( say a brake hose ruptures ), the valve will be forced to one side, closing the circuit and lighting the brake warning light on the dash.

As in most typical " idiot" lights you are not going to need this little " lite " reminding you that something is not quite right.

You'll know it soon enough when the brake pedal goes ( almost )to the floor and the only skid marks you leave won't be on the pavement....but in your shorts!!!

 

DO YOU REally need this wire on the prop valvethough?

 

No....

 

when you install a wilwood propotioning valve i assume this wire gets deleted? will that throw a code constantly? thanks,

 

that wire is the ground for the "BRAKE" light on the dash.

thats it. its not connected to any computer, or any other circuit.



the "BRAKE" light comes one one of two ways:

the prop valve grounds it due to brake failure
or
the Ebrake grounds it when its not down all the way.



it is only a warning light... when you connect a wilwood prop valve, its no longer needed.. you can clip it short, or use it for other things.

i use mine to kickon the light whenever i turn my line lock on....

 

Wow, that sounds like an awsome setup. May I ask how you did that?
Line-lock was the next item on my shopping list (after i get my brakes working... )

 

when i push the line lock on, it puts the wire to ground... its nothing special

 

heh, heres what i have.

yes, you need the diode.

or use a DPDT switch.....

 

cool man, thanks

 

cool man, thats very simple.

Thanks.

 

cool man, thats very simple.

Thanks.

 

cool man, thats very simple.

Thanks.

 

That's an awesome idea that I believe I'll be using. Question: why do you still need the diode connected? Isn't the brake light essentially replacing it?

 

Because Mr. Dude, ( for all his artistic abilities ) did not show the second ground circuit for the Brake light. IE: The parking brake lever ground. The Line lock solenoid can also ground through this circuit. You don't want that.

Say you came up to a train crossing and a long train was going by. You leave the engine on to listen to tunes, pull on the Park brake and listen to " In the Gada Da Vida ". All this time the Line Lock solenoid would be energised. It's not meant to be energised for long periods of time. Would over heat and fail before it normally should.

That's why you need the Diode.

PS: Same thing would happen in the " Accessory " position. Say you're in the Park late at night with your date, listening to " Romantic favorites "and steamin' up the windows........ The last thing you want happening is your date to say: " Honey..... I smell something burning ".

 

lol, yup...

here, i'll add it for ya. lol

 

well.....Chickenman35.....

that was very imformative....thank you....hehe

 

lol, I got the answer and 2 scenarios to go with it! It all makes sense now... except for the "in the gada da vida" thing... I don't think I'd be listening to that. Besides, I always thought it was one long weird word: "Ena-gada-davida". LOL

 

Longest freakin' song in Rock history I think ....LOL