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#1 |
Registered User
Join Date: Dec 2001
Location: Mansfield Texas
Posts: 645
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Brake Light...Out of the blue!
The other day, I start up the truck. Sure, it has been sitting there for a bit but it cranked right up but out of the blue the Brake Light on the instrument panel comes on. I have checked the master cylinder and there is plenty of brake fluid. So, what gives?????
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1972 Chevy Custom/10 www.PictureTrail.com/KP1972 Metroplex Muscle Car Club www.PictureTrail.com/DreamCarArt |
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#2 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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With disc/drums it usually means something is out of balance on the pressure between the fronts and rears. Can be a fluid leak or crud in the proportioning valve or master cylinder. Start with a leak check by inspecting the calipers on the front and the wheel cylinders on the rear. Also check all the brake lines.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#3 |
Chevy Nuttttt
Join Date: Sep 2004
Location: Santa Maria Ca.
Posts: 568
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the ebrake may be setting it off, or the master cylender may be going bad
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67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell ![]() ![]() |
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#4 |
Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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Yep, pull up on the e-brake pedal to make sure it's not that before you go nuts.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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#5 |
Senior Member
Join Date: Mar 2002
Location: 12 Miles South of Des Moines, Iowa
Posts: 359
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I don't recall that I have ever see the brake light come on in my truck when i set the e-brake. I've never see that light come on except for when i start it. is something wrong with my truck? or where is the swith to turn it on with the e-brake?
Sorry don't mean to intrude on your thread but i figured they were on the same lines. Nathan
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69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran ![]() Nathan & Tiffany |
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#6 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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I don't remember there being an electrical switch on the e-brake pedal for the light.
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I'm on the Instagram- @Gearhead_Kevin |
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#7 |
Senior Member
Join Date: Mar 2002
Location: 12 Miles South of Des Moines, Iowa
Posts: 359
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good neither do I
Nathan
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69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran ![]() Nathan & Tiffany |
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#8 |
Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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ooops! You guys are right, I'm wrong. I musta had a brain fart.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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#9 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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Sometimes if you pump your brakes hard the valve will equalize and the light will go out for a moment. I guess it could be crud. I would be looking real hard for fluid leaks.
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The truck... you hear that? No really, you did hear that?!!! |
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#10 |
CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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I know for a fact 71/72 trucks have a switch that will turn the light on..as well as brake problems...they are wired parallel...here's a pic of the switch
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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#11 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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I had to go out and triple check but my 72 C20 Super doesn't got it. Nor holes for it.
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The truck... you hear that? No really, you did hear that?!!! |
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#12 |
Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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Nope, mine don't have that parking brake switch either. Rare option or add on?
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. ![]() ![]() ![]() |
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#13 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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my 72 doesnt have it either. Sound like the proportioner valve stuck. you'll find out when you try to bleed the brakes.One of the wheels wont get any brake fluid if the valve sticks.got to start with an inspection first.wheel cylinders or a brake line could be the problem.look under the rear end for fluid at the inside wheel rims at the bottom of the rim .
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![]() 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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#14 |
Registered User
Join Date: Oct 2004
Location: SSF CA
Posts: 34
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Check this website, scroll 3/4's of the way down, you'll find a way to check your proportioing valve. Also, the shop manual for these trucks spells it out. TJ
http://www.classicperform.com/TechBo...t.htm#testprop |
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