Need help with break lights - The 1947 - Present Chevrolet & GMC Truck Message Board Network

taxi driver · 01-07-2008, 07:31 PM

I just bought a 72 C-10 and the break lights do not work at all. It has had a complete frame off restoration with new wiring. The rear light is a red LED setup for the turn, break and ruining light.

Does and one have a wiring diagram for the lights?

And does anyone know where the switch for the breaks is? Is it on the master cylinder?

Thanks for the help.

usernamessuck · 01-07-2008, 07:45 PM

The switch for the break light is on the back of the brake pedal arm.

Slammed70 · 01-08-2008, 04:13 PM

Quote:

Originally Posted by taxi driver

I just bought a 72 C-10 and the break lights do not work at all.

You spelled brake wrong....

Quote:

Originally Posted by usernamessuck

The switch for the break light is on the back of the brake pedal arm.

....so did you

**VetteVet** · 01-07-2008, 07:47 PM

The brake light switch is on a bracket just above the brake pedal pad.
Do the turn signals work? They use the same wires as the brake lights.
Have you checked the bulbs and housings for good bulbs and good grounds
on the housings?
click on this link and go to post 19 for a wiring diagram.
http://67-72chevytrucks.com/vboard/s...d.php?t=185856

taxi driver · 01-07-2008, 07:54 PM

The signal lights work.

There is no switch on or near the break pedals, but there is a single light brown wire coming out of the master calendar near the booster

68GMCCustom · 01-07-2008, 08:00 PM

the switch should be behind the dash, above the pedals.

**VetteVet** · 01-07-2008, 08:07 PM

[QUOTE=taxi driver;2517963]The signal lights work.

There is no switch on or near the break pedals, but there is a single light brown wire coming out of the master calendar near the booster[/QUOTE]

This is the brake warning light wire for low pedal or fluid pressure. It has nothing to do with your problem. I do not understand why the brake light switch is not where I said it should be. The LED turn lights use a different flasher because of the decreased current load they draw, but if the turn signals work then yours are correct, and they have no effect on the brake lights as far as I know.

Andy4639 · 01-07-2008, 08:23 PM

If there is no switch under the dash that is mounted to the bracket where the brake pedal will push it in when not in use. You want have any light's. If my memory serves me correct it's white plastic and looks like a pen with 2 electrical connections in black plastic cliped to it.

**VetteVet** · 01-07-2008, 08:36 PM

It looks like this.

FRENCHBLUE72 · 01-07-2008, 09:13 PM

You will have to look up under the dash for the piece. Should be right near the steering column and brake pedal up high.

BigA · 01-08-2008, 03:39 PM

Have fun instaling the brake light switch. I had to replace mine in a 71 chevy. If I had to choose between yard work and changing the switch guess which I would do. You have so little room for a wrench and it will take forever. One tip, after a few days of driving check the switch to make sure it is secure. The repair manual says the brake pedel switch should activate the brake lights about 3/8 to 5/8 inches. Hope this helps.

01-07-2008, 07:31 PM	#1
taxi driver Registered User Join Date: Dec 2007 Location: vancouver BC Posts: 8	Need help with break lights I just bought a 72 C-10 and the break lights do not work at all. It has had a complete frame off restoration with new wiring. The rear light is a red LED setup for the turn, break and ruining light. Does and one have a wiring diagram for the lights? And does anyone know where the switch for the breaks is? Is it on the master cylinder? Thanks for the help.

01-07-2008, 07:45 PM	#2
usernamessuck Registered User Join Date: Feb 2006 Location: NE Wyoming Posts: 98	Re: Need help with break lights The switch for the break light is on the back of the brake pedal arm.

01-07-2008, 07:47 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Need help with break lights The brake light switch is on a bracket just above the brake pedal pad. Do the turn signals work? They use the same wires as the brake lights. Have you checked the bulbs and housings for good bulbs and good grounds on the housings? click on this link and go to post 19 for a wiring diagram. http://67-72chevytrucks.com/vboard/s...d.php?t=185856 __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-07-2008, 07:54 PM	#5
taxi driver Registered User Join Date: Dec 2007 Location: vancouver BC Posts: 8	Re: Need help with break lights The signal lights work. There is no switch on or near the break pedals, but there is a single light brown wire coming out of the master calendar near the booster

01-07-2008, 08:00 PM	#6
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Need help with break lights the switch should be behind the dash, above the pedals. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

01-07-2008, 08:07 PM	#7
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Need help with break lights [QUOTE=taxi driver;2517963]The signal lights work. There is no switch on or near the break pedals, but there is a *single light brown wire coming out of the master calendar near the booster[/QUOTE*] This is the brake warning light wire for low pedal or fluid pressure. It has nothing to do with your problem. I do not understand why the brake light switch is not where I said it should be. The LED turn lights use a different flasher because of the decreased current load they draw, but if the turn signals work then yours are correct, and they have no effect on the brake lights as far as I know. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-07-2008, 08:23 PM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Need help with break lights If there is no switch under the dash that is mounted to the bracket where the brake pedal will push it in when not in use. You want have any light's. If my memory serves me correct it's white plastic and looks like a pen with 2 electrical connections in black plastic cliped to it. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-07-2008, 08:36 PM	#9
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Need help with break lights It looks like this. Attached Images __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-07-2008, 09:13 PM	#10
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	Re: Need help with break lights You will have to look up under the dash for the piece. Should be right near the steering column and brake pedal up high. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

01-08-2008, 03:39 PM	#11
BigA Registered User Join Date: Nov 2000 Location: Manhatan,KS USA Posts: 51	Re: Need help with break lights Have fun instaling the brake light switch. I had to replace mine in a 71 chevy. If I had to choose between yard work and changing the switch guess which I would do. You have so little room for a wrench and it will take forever. One tip, after a few days of driving check the switch to make sure it is secure. The repair manual says the brake pedel switch should activate the brake lights about 3/8 to 5/8 inches. Hope this helps.



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