Mystery brown wire behind master cylinder - Team Camaro Tech
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post #1 of 24 (permalink) Old Aug 5th, 13, 02:20 PM Thread Starter
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Jerry McDaniel
 
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Mystery brown wire behind master cylinder

I was poking around today as my brakes feel like mush. I noticed a brown wire hanging behind my master cylinder. I have a Camaro book coming so I can ID this stuff but it isn't here yet. Can you guys ID this wire?

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post #2 of 24 (permalink) Old Aug 5th, 13, 02:22 PM
Shane
 
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Re: Mystery brown wire behind master cylinder

I believe that wire is for the switch on the proportioning valve or splitter valve underneath the master cylinder
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post #3 of 24 (permalink) Old Aug 5th, 13, 02:27 PM
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Greg
 
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Re: Mystery brown wire behind master cylinder

Brake Light Switch

1969 RS/SS Vert

1031 Engineering llc
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post #4 of 24 (permalink) Old Aug 5th, 13, 02:30 PM Thread Starter
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Jerry McDaniel
 
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Re: Mystery brown wire behind master cylinder

I meant behind the booster I guess. I'll check under the valve ----
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post #5 of 24 (permalink) Old Aug 5th, 13, 02:46 PM
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Re: Mystery brown wire behind master cylinder

There should be an exposed male terminal blade on the valve that all the brake lines attach to under the master.
Inside that black boot on the wire should be a straight female blade slot.

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post #6 of 24 (permalink) Old Aug 5th, 13, 02:46 PM Thread Starter
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Jerry McDaniel
 
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Re: Mystery brown wire behind master cylinder

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Oddly the wire wont reach the socket. What does it do?
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post #7 of 24 (permalink) Old Aug 5th, 13, 02:54 PM
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Re: Mystery brown wire behind master cylinder

oops... I meant round.... not flat blade style.

Does the boot have a small hole in the center? If so, it fits that terminal on the valve. Did the car originally not have a booster? Maybe that's why it's so short.
Mine was manual also, but the wire was still long enough to reach once I put the booster on.

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post #8 of 24 (permalink) Old Aug 5th, 13, 03:00 PM Thread Starter
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Jerry McDaniel
 
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Re: Mystery brown wire behind master cylinder

No booster originally this is an after market disc brake setup. What does the wire do?
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post #9 of 24 (permalink) Old Aug 5th, 13, 03:03 PM
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Re: Mystery brown wire behind master cylinder

It lights the BRAKE idiot light on the dash if the brake pressure is abnormal such as when the master gets low on fluid, or there's a leak in the brake system somewhere.
There's a corresponding brown wire inside that attaches to the Parking Brake switch under the dash. Both of them will light the idiot light. No offense.

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post #10 of 24 (permalink) Old Aug 5th, 13, 03:08 PM Thread Starter
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Re: Mystery brown wire behind master cylinder

Brake Light warning Switch? What the heck does that do?
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post #11 of 24 (permalink) Old Aug 5th, 13, 03:10 PM Thread Starter
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Re: Mystery brown wire behind master cylinder

Ok, I don't have an idiot light I guess so it isn't needed. Have the Dakota gauges. Now since I know it does nothing for me I guess I gotta figure out why my brake pedal goes almost to the floor!

Thanks Joe
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post #12 of 24 (permalink) Old Aug 5th, 13, 03:22 PM
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Re: Mystery brown wire behind master cylinder

My Dakota gauges have a place on the controller for the dash Brake light wire. The wire to the light in the dash goes to the controller instead of the dash light bulb.
That way I know when the brake fluid is low, the brakes are about to fail... or I'm gonna crash.

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post #13 of 24 (permalink) Old Aug 5th, 13, 08:18 PM Thread Starter
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Jerry McDaniel
 
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Re: Mystery brown wire behind master cylinder

Ok, I checked and yes I guess I do as well. Now what is curious is the white fitting on the valve looked like a black boot from the wire was on there as there was some black residue. But when I try to attach it I don't get the feeling I am getting that boot to fit the connection properly even if I had a few more inches of wire. Hmmm the white fitting has two lips and I get over the first one but not the second and the boot just kinda pops off
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post #14 of 24 (permalink) Old Aug 5th, 13, 10:33 PM
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Re: Mystery brown wire behind master cylinder

I say its the wire for the under hood lamp.

Dave

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post #15 of 24 (permalink) Old Aug 6th, 13, 05:07 AM
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Re: Mystery brown wire behind master cylinder

https://www.camaros.net/forums/showthread.php?t=206770

Can't find the hood light wiring in this diagram. Has to be on the Options diagram. I thought the underhood and trunk lights were orange. Could it have gone to a cowl hood flapper solenoid?

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Last edited by HwyStarJoe; Aug 6th, 13 at 05:33 AM.
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