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

heirless · 10-30-2004, 11:43 PM

i have a 1988 chevy half ton, the brake light on dash stays on all the time,while switch is on, can any one tell me why, the pads are all good, the rear wheel cylinders have been replaced, fronts are working ok. i have tried pulling up on the emergency brake pedal but does not make light go off.

GM-TECH · 10-31-2004, 01:14 AM

There are only a few things that you can do unless you have diagnostic equipment so as to pull the trouble code that indicates the problem area or faulty component. In addition to what you have already indicated you have checked:
1 Check the electrical connections at the control unit (mounted under master cyl)

2 Check all fuses

3 Follow the wiring harness to the speed sensor(s) and brake light switch and
make sure all connections are secure and that wiring is not damaged.

If this does not help vehicle needs to be diagnosed by a dealer service department. Hope this helps.

ChevyTech · 10-31-2004, 05:09 PM

Hi hairless

There are three brightness levels of the dash brake indicator light on your truck.

Brightest – park brake
Medium – Combination valve (aka metering & proportioning valve)
Dim – RWAL System

Watch the light very closely and apply the parking brake. Did the light get brighter?

ChevyTech

heirless · 11-01-2004, 12:41 AM

the brake light always stays on bright no matter if i push the brake pedal

99-2door · 11-01-2004, 05:10 AM

Are you pushing the brake pedal or the "park" brake pedal?
Unplug the wire from the park brake pedal assembly to see if it goes off.

STEVE A WILBURN · 11-01-2004, 08:16 AM

my 88 will do the same thing . if i push the brake just a little at startup. i just pull the plug on the master cylinder, and wait a few and plug it back the light goes out. steve

ChevyTech · 11-01-2004, 01:45 PM

Quote:

Originally Posted by 99-2door

Unplug the wire from the park brake pedal assembly to see if it goes off.

If it makes no difference when you push the park brake then I agree with 99-2door.

heirless · 11-02-2004, 10:02 PM

well i have checked the wires under the hood next to the master cylinder, the plugs are all ok, next i went to the brake pedal and checked the plug there, plug is ok. but now the light is off, will have to watch it and see if it comes on again, and start all over checking each connection and then checking light to see if it goes out, to tell which fixes problem.
thanks to all for info.
terry

10-30-2004, 11:43 PM	#1
heirless Registered User Join Date: Mar 2004 Posts: 15	brake light i have a 1988 chevy half ton, the brake light on dash stays on all the time,while switch is on, can any one tell me why, the pads are all good, the rear wheel cylinders have been replaced, fronts are working ok. i have tried pulling up on the emergency brake pedal but does not make light go off.

11-01-2004, 05:10 AM	#5
99-2door Registered User Join Date: Oct 2003 Location: Broken Bow, OK Posts: 1,385	Are you pushing the brake pedal or the "park" brake pedal? Unplug the wire from the park brake pedal assembly to see if it goes off. __________________ 95 K3500 SRW 5.7L Vortec 4L80e 4.10 G80 2001 GMC C3 6.0 AWD, Volant, 3/5 drop TBSS intake, HP tuners, pullies, 05 efans, 05 front brakes, etc. 2003 Tahoe Z71 Silverado front clip

11-01-2004, 08:16 AM	#6
STEVE A WILBURN Registered User Join Date: Feb 2004 Location: TONEY ALA Posts: 307	my 88 will do the same thing . if i push the brake just a little at startup. i just pull the plug on the master cylinder, and wait a few and plug it back the light goes out. steve __________________ JUST HAPPY TO BE ALIVE.

10-31-2004, 01:14 AM	#2
GM-TECH Registered User Join Date: Oct 2004 Location: Sacramento Posts: 42	There are only a few things that you can do unless you have diagnostic equipment so as to pull the trouble code that indicates the problem area or faulty component. In addition to what you have already indicated you have checked: 1 Check the electrical connections at the control unit (mounted under master cyl) 2 Check all fuses 3 Follow the wiring harness to the speed sensor(s) and brake light switch and make sure all connections are secure and that wiring is not damaged. If this does not help vehicle needs to be diagnosed by a dealer service department. Hope this helps.

10-31-2004, 05:09 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Hi hairless There are three brightness levels of the dash brake indicator light on your truck. Brightest – park brake Medium – Combination valve (aka metering & proportioning valve) Dim – RWAL System Watch the light very closely and apply the parking brake. Did the light get brighter? ChevyTech

11-01-2004, 12:41 AM	#4
heirless Registered User Join Date: Mar 2004 Posts: 15	the brake light always stays on bright no matter if i push the brake pedal

11-02-2004, 10:02 PM	#8
heirless Registered User Join Date: Mar 2004 Posts: 15	well i have checked the wires under the hood next to the master cylinder, the plugs are all ok, next i went to the brake pedal and checked the plug there, plug is ok. but now the light is off, will have to watch it and see if it comes on again, and start all over checking each connection and then checking light to see if it goes out, to tell which fixes problem. thanks to all for info. terry



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