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04-02-2004, 12:12 AM
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#1 |
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Registered User
Join Date: Jan 2002
Location: Calgary, Alberta, Canada
Posts: 451
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Wire question - brown wire going to proportioning valve
What is the brown wire going to the proportioning valve on my 72 with power brakes? I am installing a new Painless Wiring harness into the entire truck, and there is no mention of this wire in the manual.
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72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components. |
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04-02-2004, 12:19 AM
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#2 |
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Registered User
Join Date: Feb 2004
Location: Massachusetts
Posts: 269
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It's the brake failure warning switch.
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72 Cheyenne Super 4x4 SWB |
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04-02-2004, 12:22 AM
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#3 |
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On the road
  
Join Date: Jan 2004
Location: NATCHITOCHES LOUISIANA
Posts: 810
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That's for the brake light in your dash. Not sure of all the ins and outs, I guess if you lose pressure ( I don't know how much pressure it takes to operate ) the light comes on.
Mike |
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04-02-2004, 12:22 AM
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#4 |
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Registered User
Join Date: Feb 2004
Location: Massachusetts
Posts: 269
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It should go to the ignition switch, and then to the cluster I think.
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72 Cheyenne Super 4x4 SWB |
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04-02-2004, 12:24 AM
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#5 |
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Registered User
Join Date: Feb 2004
Location: Massachusetts
Posts: 269
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I think it is triggered by a large differential between front and rear brakes.
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72 Cheyenne Super 4x4 SWB |
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04-02-2004, 12:19 PM
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#6 |
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Registered User
Join Date: Feb 2000
Location: Georgetown, KY, USA
Posts: 631
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There is a toggle switch inside of the Prop. valve with a diaphram that is pushed to either side by a large difference in pressure on one side or the other it grounds the signal and turns the light on. Also a grounding Emer. brake switch can be tied in to the wire to let you know that your E brake is....not that any of us have ever drove anywhere with our E Brake on!!!
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04-02-2004, 12:24 PM
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#7 |
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Registered User
Join Date: Jul 2003
Location: Cypress, Tx
Posts: 4,005
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Yeah, mine came on when I had manual brakes right before they started going out on me (before the power brake swap). I was quite impressed that after 30 years it actually still worked.
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1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE |
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04-02-2004, 01:21 PM
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#8 |
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More Cowbell....
Join Date: Mar 2004
Location: Puckett, MS
Posts: 3,569
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After 35 years, mine actually came on last November. All of the fluid from the front half of the master cylinder had leaked out, and I fired it up and moved it outside the garage. When I hit the brake, it went to the floor and the light came on. I was like....Woh!
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There once was a member from Puckett.....Who ( fill in the blank blank blank ) bucket |
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04-02-2004, 02:32 PM
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#9 |
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Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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How do you check it to see if it still works?
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04-02-2004, 02:39 PM
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#10 |
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Beer Power!!!!!!!!!!
Join Date: Nov 2003
Location: Nacogdoches, TX
Posts: 280
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To check if it still works, simply disconnect the wire from the valve.
I had to replace my prop valve because, I guess, the old one wore out. TIP: Your old proportioning valve makes an EXCELLENT trotline weight.
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Rather be fishin' |
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