brake light stays on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68_c10_on20s · 07-26-2003, 05:48 PM

my brake light stays on on my gauge till i unhook the plug at the master cylinder ,it has plenty of fluid so what else could it be?air in the lines or what?

krazy_texan · 07-26-2003, 07:14 PM

could be air in the lines or it could be that you need new shoes and pads, the light is just doing it's job, mine did the same thing a while back and i ignored it because i thought it was a wiring bug but when i did pull off the tire i had to get new drums so you really need to check your brakes.

**Stocker** · 07-26-2003, 07:20 PM

Have you done any brake work lately, particularly the master cylinder? If your proportioning valve body has what looks like a black button on the front of it, try pushing in on it.

jhow66 · 07-26-2003, 09:40 PM

That light tells you that one side of your brakes are not working. The problem most likely is your MC. It is not putting pressure to the front or back brakes. When this happens there is a piston inside the prop. valve that slides to the side that has no pressure and grounds the light.(when working right same pressue on both sides of piston.)If your have done what Stocker said, hold valve in while someone applies brakes until light goes out.

07-26-2003, 05:48 PM	#1
68_c10_on20s Registered User Join Date: Aug 2002 Location: Waxahachie TX Posts: 773	brake light stays on my brake light stays on on my gauge till i unhook the plug at the master cylinder ,it has plenty of fluid so what else could it be?air in the lines or what? __________________ 93 Fleet Budget Build http://s150.photobucket.com/albums/s...zted71/hoopty/

07-26-2003, 07:14 PM	#2
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	could be air in the lines or it could be that you need new shoes and pads, the light is just doing it's job, mine did the same thing a while back and i ignored it because i thought it was a wiring bug but when i did pull off the tire i had to get new drums so you really need to check your brakes. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

07-26-2003, 07:20 PM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Have you done any brake work lately, particularly the master cylinder? If your proportioning valve body has what looks like a black button on the front of it, try pushing in on it. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

07-26-2003, 09:40 PM	#4
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	That light tells you that one side of your brakes are not working. The problem most likely is your MC. It is not putting pressure to the front or back brakes. When this happens there is a piston inside the prop. valve that slides to the side that has no pressure and grounds the light.(when working right same pressue on both sides of piston.)If your have done what Stocker said, hold valve in while someone applies brakes until light goes out. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

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