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08-20-2006, 05:56 AM
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#1 |
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Registered User
Join Date: Mar 2004
Location: Aviano, Italy
Posts: 221
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72 Brake Warning Light
Am I missing something or is there no brake failure warning light in a 72 C10?
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08-20-2006, 06:04 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: 72 Brake Warning Light
There should be a brake light in the lower left of the fuel gauge that comes on with the key. I would check the bulb first and if that is good check the sender unit that is on the prop valve.
Jim |
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08-20-2006, 11:51 AM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: 72 Brake Warning Light
yup, a brown wire should be plugged into your proportioning valve. With the ignition switch on, the light will (should) come on if you ground that wire.
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08-21-2006, 02:43 PM
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#4 |
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Registered User
Join Date: Mar 2004
Location: Aviano, Italy
Posts: 221
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Re: 72 Brake Warning Light
Man, I must be getting old, I did not see it. OK, lazy is more like it. Just never noticed it coming on when cranking. I grounded at the P valve and it works. I watched while cranking and it came on. Sorry to have wasted server space!
So I see no switch on the E-brake assembly but on the wiring circuit it shows #209 Purple. I am guessing it ain't there since I can't find it. Anybody install a switch on the e-brake and splice into the circuit? Wife has problem understanding the e-brake release thing unless the light tells her... Last edited by crustysarge; 08-21-2006 at 02:46 PM. |
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08-21-2006, 03:16 PM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: 72 Brake Warning Light
I've been wanting to do this to mine, my first one had a micro switch installed. It's a fairly easy mod...but since my parking brake really doesn't work, it seems kinda stupid to rig up a light.
Every GM truck i have messed with (in that area), that wire is tan, not purple. Just for the record. |
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08-22-2006, 07:00 PM
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#6 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: 72 Brake Warning Light
I had the same problem the wife driving my truck with the E-brake still active. I installed a reed switch and splice the tan wire. No drilling was needed to install the switch, only double sided tape. If pics are needed, I can post some.
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08-23-2006, 09:25 PM
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#7 |
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Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,759
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Re: 72 Brake Warning Light
Please post pictures! This is a great idea.
__________________
'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer |
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08-25-2006, 09:20 PM
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#8 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: 72 Brake Warning Light
Will post them this weekend.
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08-26-2006, 07:34 PM
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#9 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: 72 Brake Warning Light
Here are the pics.
The reed switch cost me about $4. |
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08-26-2006, 07:39 PM
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#10 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: 72 Brake Warning Light
The black/white wire (ground) is connected to common and the brown wire is connected to NC.
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08-26-2006, 10:17 PM
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#11 | |
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Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,759
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Re: 72 Brake Warning Light
Quote:
Where can I purchase a reed switch?
__________________
'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer |
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08-27-2006, 01:30 AM
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#12 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: 72 Brake Warning Light
Badpeanut
The tan wire is splice into the tan wire from the proportioning valve. The reed switch I bought from Fry's Electronics. |
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08-27-2006, 07:35 AM
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#13 |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,468
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Re: 72 Brake Warning Light
That's a
 mod, and inexpensive too 
__________________
Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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08-27-2006, 02:57 PM
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#14 |
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Registered User
Join Date: Mar 2004
Location: Aviano, Italy
Posts: 221
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Re: 72 Brake Warning Light
Any 70's GM car that has a switch should work. I looked at my 77 Trans Am and the brake assembly is very similiar. It has a sping loaded switch mounted with a small bracket and works like a brake pedal switch circuit. Be easy to do.
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