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

redneck_chev · 12-23-2002, 02:39 AM

Hey fellers
My brake light on the dash stays on. How can I fix it. I crawled underneath the truck but couldn't see no leaks. It stops as good as always. It has drums all around it. I put a new master cylinder on about 5 months ago. So I don't know what is causing the light to stay on!
Any help would be a great help.

oldyeller · 12-23-2002, 05:45 AM

did ya check the fluid level in the master cylinder, or the wire that hooks to the prop. valve?

wlee · 12-23-2002, 12:44 PM

You may have some air in the system from the M/C replacement, but your problem should have shown up sooner than 5 months - more likely it's the proportioning valve

ckhd · 12-23-2002, 01:41 PM

Has it been on since before the MC change 5 months ago, or is the light a recent thing?

redneck_chev · 12-23-2002, 05:27 PM

I have check the levels. They are o.k. The wire seems to have good connection.
If there is air in the propotion valve. How can I get it out By myself.
The light is a recent thing. How hard is it to replace the p/v.

**john** · 12-23-2002, 07:31 PM

If it is the p/v the light should go out when you unhook the wire. I would bleed the brakes again and see if the valve centers itself.

Don Smith · 12-24-2002, 12:17 AM

Try pushing on brake pedal hard (approx. 100 lbs ) this should reset piston in proportioning valve which is probably causing light to stay on.

junkyardjohn · 12-24-2002, 12:40 AM

IF YOUR FLUID LEVEL IS GOOD, & YOUR PEDAL IS HARD & NOT SPONGEY, TRY STOMPING ON YOUR PEDAL (KINDA LIKE A PANIC STOP) & IT WILL PROBABLY RESET YOUR PROP. VALVE. LET ME KNOW IF THIS WORKS. JOHN

71Custom10 · 12-24-2002, 01:22 AM

I had the same problem. Good brakes but the light stayed on. I replaced the sensor that the wire goes to with one from a parts truck and that fixed the problem. The light now comes on when I start the truck then goes out. Andrew

**Bernie** · 12-24-2002, 11:22 AM

I had the same thing with the light. I thought there had been no fluid loss, but when I pulled the drums I found a bad wheel cylinder. Just leaked enough apparently for the light to come on.

Long Knight · 12-24-2002, 12:31 PM

My breaks were horrible and the only time my light came on was when my emergency break pedel slipped down.

redneck_chev · 12-24-2002, 02:21 PM

Well I pushed the pedal real hard and real quick.
Then unpluged the wire . Then pluged it back up. The light went out. Now it comes on when I start the truck then it goesout . Like it is supposed to do.
But as soon as I can get in the garage. I will check the wheel cylinders again. For any leaks. Once again
"THANKS FOR ALL HELP" I couldn't do with out you guys.

redneck_chev

12-23-2002, 02:39 AM	#1
redneck_chev Registered User Join Date: May 2000 Location: Jeffersonville, Kentucky Posts: 28	Brake light stays on? Hey fellers My brake light on the dash stays on. How can I fix it. I crawled underneath the truck but couldn't see no leaks. It stops as good as always. It has drums all around it. I put a new master cylinder on about 5 months ago. So I don't know what is causing the light to stay on! Any help would be a great help. __________________ 1967 Chevy C-10 fleetside SB 3speed on column Corvette yellow#35 Black W/Red Metal Flake int. looks like Black cherry Diamond White Pearl /Grille Jenson CD system Wooden bed

12-23-2002, 05:45 AM	#2
oldyeller Captain CAAAVVVMMMAAANNN! Join Date: Mar 2002 Location: Anna Texas Posts: 726	did ya check the fluid level in the master cylinder, or the wire that hooks to the prop. valve? __________________ 72 LWB Fleetside C10 Custom 350/350 97 GMC Yukon 4X4 SLT Anna, Texas check out the project old yeller

12-23-2002, 12:44 PM	#3
wlee Just an Old Mr Goodwrench Join Date: Feb 2002 Location: Green Ridge, MO USA Posts: 259	You may have some air in the system from the M/C replacement, but your problem should have shown up sooner than 5 months - more likely it's the proportioning valve __________________ 1969 CST 20 Longhorn 1970 CST 20 Fleetside 1991 Jaguar Sovereign 1992 Mazda Miata

12-23-2002, 01:41 PM	#4
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	Has it been on since before the MC change 5 months ago, or is the light a recent thing? __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

12-23-2002, 05:27 PM	#5
redneck_chev Registered User Join Date: May 2000 Location: Jeffersonville, Kentucky Posts: 28	thanks for the help! I have check the levels. They are o.k. The wire seems to have good connection. If there is air in the propotion valve. How can I get it out By myself. The light is a recent thing. How hard is it to replace the p/v. __________________ 1967 Chevy C-10 fleetside SB 3speed on column Corvette yellow#35 Black W/Red Metal Flake int. looks like Black cherry Diamond White Pearl /Grille Jenson CD system Wooden bed

12-23-2002, 07:31 PM	#6
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	If it is the p/v the light should go out when you unhook the wire. I would bleed the brakes again and see if the valve centers itself. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

12-24-2002, 12:17 AM	#7
Don Smith Registered User Join Date: Jul 2000 Location: Hampton, Ga, USA Posts: 217	Try pushing on brake pedal hard (approx. 100 lbs ) this should reset piston in proportioning valve which is probably causing light to stay on. __________________ 68 Short Stepside, 350, quadrajet, 700r4, 3:73 posi, power front discs, HEI, Factory Air, Tilt, Tach, accelerator cable instead of rod, sway bar. 96 Impala SS 97 Monte Carlo

12-24-2002, 12:40 AM	#8
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	IF YOUR FLUID LEVEL IS GOOD, & YOUR PEDAL IS HARD & NOT SPONGEY, TRY STOMPING ON YOUR PEDAL (KINDA LIKE A PANIC STOP) & IT WILL PROBABLY RESET YOUR PROP. VALVE. LET ME KNOW IF THIS WORKS. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

12-24-2002, 01:22 AM	#9
71Custom10 Registered User Join Date: Feb 2000 Location: Temple, Texas Posts: 325	I had the same problem. Good brakes but the light stayed on. I replaced the sensor that the wire goes to with one from a parts truck and that fixed the problem. The light now comes on when I start the truck then goes out. Andrew __________________ '67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service

12-24-2002, 11:22 AM	#10
Bernie Senior Member Join Date: Jan 2001 Location: Northern Illinois Posts: 516	I had the same thing with the light. I thought there had been no fluid loss, but when I pulled the drums I found a bad wheel cylinder. Just leaked enough apparently for the light to come on. __________________ Bernie

12-24-2002, 12:31 PM	#11
Long Knight Spank 'em if you got 'em! Join Date: Nov 2002 Location: Kansas City Posts: 628	My breaks were horrible and the only time my light came on was when my emergency break pedel slipped down. __________________ Long Knight '71 C-20, 350ci, TH350, Edl. 1406 Carb w/elec.choke, Ignitor ignition, Viper Tires, Orange Dipstick

12-24-2002, 02:21 PM	#12
redneck_chev Registered User Join Date: May 2000 Location: Jeffersonville, Kentucky Posts: 28	Thanks Guys It Fixed It Well I pushed the pedal real hard and real quick. Then unpluged the wire . Then pluged it back up. The light went out. Now it comes on when I start the truck then it goesout . Like it is supposed to do. But as soon as I can get in the garage. I will check the wheel cylinders again. For any leaks. Once again "THANKS FOR ALL HELP" I couldn't do with out you guys. redneck_chev __________________ 1967 Chevy C-10 fleetside SB 3speed on column Corvette yellow#35 Black W/Red Metal Flake int. looks like Black cherry Diamond White Pearl /Grille Jenson CD system Wooden bed



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