Brake light still wont go off. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevydog66 · 03-25-2006, 08:58 PM

I have bench bled the M/C, installed new s/s front brake lines, prop. valve, calipers, braided brake lines, rear wheel cylinders, rear flex line, bled the system numerous times, gravity bled the system 2 times, and the brake light is still on. The new prop. valve is shaped differently than the original one. I purchased a new one from Chevy Duty. It seems like there is fluid at the bottom of the prop. valve. I am getting very tired of dealing with this problem. Any ideas? Or suggestions.

**truckdude239** · 03-25-2006, 09:21 PM

check the wire coming off the p vavle and follow it and see if it is grounding somewhere that will make the light come on

Longhorn Man · 03-25-2006, 11:30 PM

An easier way to do that, would be to unplug that brown wire and see if the light goes off. If it stays on, then the wire is grounded elsewhere.

northcountry67 · 03-25-2006, 11:38 PM

It is likely that the switch in the p-valve is stuck from the previous brake problem. Do what Longhorn suggested and unplug it to see if the light goes off.

Bob D · 03-26-2006, 12:12 AM

What about the emergency brake? Do these trucks have a light for that? None of the idiot lights ever worked on my truck so I dont know if there is an indicator light for the e-brake.

Bob

Longhorn Man · 03-26-2006, 12:19 AM

nope, the light is only for hyd problems

Bob D · 03-26-2006, 12:22 AM

Oh well....it was worth a shot!

Bob

**VetteVet** · 03-26-2006, 01:36 AM

Hows your brake pedal freeplay. You need to have some play before the brake rod starts pushing the master cylinder piston . I like to have about 1/4 to 3/8ths of an inch.

chevydog66 · 03-26-2006, 10:25 AM

I did pull the wire off the prop. valve while the truck was running and the light went out. I will try to bleed it a few more times, and see what happens.

chops333 · 03-26-2006, 11:55 AM

Quote:

Originally Posted by chevydog66

I did pull the wire off the prop. valve while the truck was running and the light went out. I will try to bleed it a few more times, and see what happens.

i had this same problem on 73 chevy i had to go back and from end to end side to side bleeding each one untill the piston centered in the prop.valve i had a book that showed the procedure hope this helps

03-25-2006, 08:58 PM	#1
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Brake light still wont go off. I have bench bled the M/C, installed new s/s front brake lines, prop. valve, calipers, braided brake lines, rear wheel cylinders, rear flex line, bled the system numerous times, gravity bled the system 2 times, and the brake light is still on. The new prop. valve is shaped differently than the original one. I purchased a new one from Chevy Duty. It seems like there is fluid at the bottom of the prop. valve. I am getting very tired of dealing with this problem. Any ideas? Or suggestions. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

03-25-2006, 09:21 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Brake light still wont go off. check the wire coming off the p vavle and follow it and see if it is grounding somewhere that will make the light come on __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

03-25-2006, 11:30 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Brake light still wont go off. An easier way to do that, would be to unplug that brown wire and see if the light goes off. If it stays on, then the wire is grounded elsewhere.

03-25-2006, 11:38 PM	#4
northcountry67 Registered User Join Date: Dec 2005 Location: Lengby, Minnesota Posts: 225	Re: Brake light still wont go off. It is likely that the switch in the p-valve is stuck from the previous brake problem. Do what Longhorn suggested and unplug it to see if the light goes off.

03-26-2006, 12:12 AM	#5
Bob D Rolled on Paint Club Join Date: Jan 2006 Location: Windham, CT. Posts: 232	Re: Brake light still wont go off. What about the emergency brake? Do these trucks have a light for that? None of the idiot lights ever worked on my truck so I dont know if there is an indicator light for the e-brake. Bob

03-26-2006, 12:19 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Brake light still wont go off. nope, the light is only for hyd problems

03-26-2006, 12:22 AM	#7
Bob D Rolled on Paint Club Join Date: Jan 2006 Location: Windham, CT. Posts: 232	Re: Brake light still wont go off. Oh well....it was worth a shot! Bob __________________ 1970 GMC 1500 swb fleetside SB 355ci. Smog heads Summit 1102 cam Performer intake and carb. Finally in about 1 piece in the yard.

03-26-2006, 01:36 AM	#8
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Brake light still wont go off. Hows your brake pedal freeplay. You need to have some play before the brake rod starts pushing the master cylinder piston . I like to have about 1/4 to 3/8ths of an inch. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

03-26-2006, 10:25 AM	#9
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: Brake light still wont go off. I did pull the wire off the prop. valve while the truck was running and the light went out. I will try to bleed it a few more times, and see what happens. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

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