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Old 03-01-2012, 09:58 PM
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need help with brake lights

ok have a problem 1996 chevy c3500
brake lights work normal till i start the engine and turn on the lights then the brake lights stay on but the brake light on the cab goes off like its supose too would that be a wireing problem or would that be a brake switch

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Old 03-01-2012, 10:03 PM
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Possible that the brake pedal is dropping when you start the truck and the vacuum is applied to the brake booster. Try adjusting the brake light switch at the pedal.
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Old 03-02-2012, 08:10 AM
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still haveing troubles

i tired to adjust the brake peddle but there is no adjustments
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Old 03-02-2012, 07:34 PM
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You need to adjust the brake light switch mounted somewhere along the brake pedal arm, the actual pedal isn't adjustable. It should have two wires coming out of it.
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Old 03-02-2012, 10:19 PM
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This should show you where the switch is in relation to your brake pedal.

http://www.justanswer.com/chevy/4zge...ht-switch.html

also read this, which describes that there is TWO fuses for the brakes , one is a maxi fuse. Also, do you have a trailer brake controller that runs off a different fuse?

http://www.truckforum.org/forums/che...ke-lights.html

"The light on the cab", that is the third brake light???

Last edited by alittle1; 03-02-2012 at 10:26 PM.
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Old 03-04-2012, 01:44 PM
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just ran into another problem

1996 Chevy c3500 i went and bought a new brake light switch dont know if it works yet because i broke a brake line fixed the line. bleed the brakes. Brake peddle is still soft like there is nothing there know matter how many time you pump the brakes the brake peddle still is soft does not get hard do i have to bleed the line at the power steering or would that be a bad master cylinder the reason why I asked if I had to bleed the power steering is because the power booster is a Hydro boost that runs off of the power steering pump
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Old 03-04-2012, 02:59 PM
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1996 chevy c3500

went to bleed the brakes again lost brake fluid on the front calipers both sides so what do you all think replace with new lines with new hoses or would that be something else that would cause this to do that
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Old 03-04-2012, 03:48 PM
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Problem is most likely not the switch. I would bet that you have a bad socket or a shorted wire that is connecting the brake light bulb to the running lights.
The simple test would be to just take the plug off the brake light switch and see if they go out. I would be willing to bet they dont.
A bad socket or even a bad bulb with the filaments shorted together will cause the issue you are having. You could test this by simply turning the lights on with the truck off and seeing if the brake lights come on.

As a side note the third brake light is always controlled separately as it does not have to interact with the directional switch.
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Old 03-04-2012, 04:50 PM
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more problems

ok i put the new brake light switch in as long as i don’t turn on the head lights or flip a switch to the flood lights and keep my foot off of the brake peddle my brake light stays off but if touch the brakes with the head lights on then my brake lights will stay on till i turn the lights off and put my foot on the brake peddle brake lights will go off but i ran into another problem with my brakes them self’s replaced a brake line went to bleed the brakes have fluid in the rears but nothing in the front on either side what would cause this
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Old 03-04-2012, 05:01 PM
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No, you shouldn't have to bleed the power boost system as it is a completely seperate system

Last edited by EOD Guy; 03-04-2012 at 05:30 PM.
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Old 03-05-2012, 02:13 PM
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The brake line that you replaced, was it on the front brakes or the rear brakes?

Did you ever press on the brakes, prior to fixing the brakes, and have the pedal go right to the floor?

Did the master cylinder run out of fluid?

What method are you using to bleed the brakes? Describe it fully.

Read this:http://www.automotix.net/autorepair/...cedure_br.html

You have a diesel, don't you?

Last edited by alittle1; 03-05-2012 at 02:20 PM.
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Old 03-05-2012, 04:12 PM
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If you replaced the brake line and let the master cylinder run dry...... you have air in the master cylinder or the proportioning valve, if equiped.

Might try the gravity bleed method, disconnect the brake line from the caliper and let gravity do it's job untill the master cylinder resivoir is 1/2 gone, reinstall the line and refill the resivoir.....back out the bleeder screw and let 1/2 half the resivoir drain........ repeat for the other side. Then do the normal, pump, hold, bleed, etc....... even if the pedal goes straight to the floor, try it a few times..... if it's still a soft pedal.... might start the engine. I'm new to the power boost system, I just installed one in my 67 camaro
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Old 03-05-2012, 06:17 PM
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just wanted to say thanks to everyone

Just wanted to say thanks to everyone that help me figure out this truck i have good brake peddle and i found out what was causing the brake lights to stay on it was a bad head light switch i thought it was weird but it worked
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Old 03-05-2012, 06:30 PM
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1996 chevy 1500 4x4 5.7 v8 my friends truck has brake issues

when he got this truck someone put motor oil in the brake reservoir he cleaned it all out and put brake fluid in it witch now has bubbles in the master cylinder and no brakes will he need a complete system or should he try and bleed the brakes
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Old 03-05-2012, 08:06 PM
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He needs to flush the system. While the oil won't hurt the workings of the brake system it will not work too well as a brake fluid due to the break down in viscosity as the system heat cycles etc......

I'd remove the lines from the calipers remove the other ends from the master cylinder, let them drain, I'd spray some brake cleaner into the lines, not the master cylinder, and use shop air to blow them out. I'd remove the calipers, fill them with fresh brake fluid and use shop air to blow them out into a pile of rag.....it's going to make a mess, then I'd remove the master cylinder pull the snap ring off and remove the piston and wash/flush the entire thing out/off with new brake fluid. Rebuild the master cylinder and bench bleed it before you mount it, reinstall the lines, bleed it..... done.
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