ABS & Brake Light stuck on

Hello! I hope this isn't a repeat thread, but I couldn't find any info so I am posting . . .

Anyhow, like the title says the warning lights are on. The pigtail coming off of the Negative battery cable snapped and caused all sorts of issues. The Alternator took a dive, too. When it happened, everything started flashing (it happened at night), the voltmeter dropped to the basement, windshield wipers came on by themselves and the cluster lit up like a Christmas Tree! Replaced both the Battery Cable and the Alternator and everything seems to be working again, except the two lights that are still on. I checked the fuse and it is good. Has this happened to anyone else? Abs was working fine until this happened.

Any info would be helpful! The rig is a '93 GMC Suburban K1500.

Thanks!

Did you erase the codes ?

This may not answer your question but it’s the best help I can give. The ABS lights on nearly every gmt400 truck I’ve seen are always on. Mine is. They’re usually not worth fixing and will pass inspection without ABS in my state so I never worried about it. As for the parking brake, sometimes the spring won’t release the pedal fully when you pull the brake release lever. Try pulling and holding the lever with one hand, and with the other, pull the foot pedal back more. There’s usually another inch or so of travel and if your parking brake switch is very sensitive, that last bit will turn the light off. It’s happened to me. Like he said though, clear your codes first. That’s a good idea.


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Tim [emoji631]

revvychevy said:

This may not answer your question but it’s the best help I can give. The ABS lights on nearly every gmt400 truck I’ve seen are always on. Mine is. They’re usually not worth fixing and will pass inspection without ABS in my state so I never worried about it. As for the parking brake, sometimes the spring won’t release the pedal fully when you pull the brake release lever. Try pulling and holding the lever with one hand, and with the other, pull the foot pedal back more. There’s usually another inch or so of travel and if your parking brake switch is very sensitive, that last bit will turn the light off. It’s happened to me. Like he said though, clear your codes first. That’s a good idea.


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Tim [emoji631]

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In all these trucks (including my '95) with always-on ABS lights, does the anti-lock feature itself still work?

I've also read that the wheels sensors commonly fail, as well as some connection(s) in the brain box under the hood.

joe

my abs light don't stay on. it was on i fixed it. a bad switch on the bottom of the steering column above the petals it is adjustable,it also fixed my torque convert lock up and my reverse lights but i doubt that is your problem.

homesick said:

In all these trucks (including my '95) with always-on ABS lights, does the anti-lock feature itself still work?

I've also read that the wheels sensors commonly fail, as well as some connection(s) in the brain box under the hood.

joe

Click to expand...

Mine’s a ‘95 too. The ABS light is on and the system doesn’t seem to work. The rear brakes lock way too quickly in bad weather. It’s a 6.5 manual so with the high compression, downshifting alone slows you to about 5 mph given you have enough distance. Somebody cut me off the other day in the rain though, I slammed the brakes, and the truck went sideways.

Do you know of anyone who’s done the rear disc brake conversion, and if it eliminates the inconsistency of the drum brakes? I wonder if that alone would halfway fix the problem. You’re right though, I’ve heard the same things about connections and wheel sensors.


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Tim [emoji631]

blacksport said:

my abs light don't stay on. it was on i fixed it. a bad switch on the bottom of the steering column above the petals it is adjustable,it also fixed my torque convert lock up and my reverse lights but i doubt that is your problem.

Click to expand...

It's still good to know, though. Thanks.

And you're saying that one switch affected all three of those things? That's surprising.

joe

revvychevy said:

Mine’s a ‘95 too. The ABS light is on and the system doesn’t seem to work. The rear brakes lock way too quickly in bad weather. It’s a 6.5 manual so with the high compression, downshifting alone slows you to about 5 mph given you have enough distance. Somebody cut me off the other day in the rain though, I slammed the brakes, and the truck went sideways.

Do you know of anyone who’s done the rear disc brake conversion, and if it eliminates the inconsistency of the drum brakes? I wonder if that alone would halfway fix the problem. You’re right though, I’ve heard the same things about connections and wheel sensors.


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Tim [emoji631]

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It seems like I read once that the early ABS systems only worked on one end of the truck, and I forget which end it was.

There's a thread on a Tahoe and Yukon site about a disc brake conversion. A pretty long thread, I think; but I haven't read it.

joe

homesick said:

It seems like I read once that the early ABS systems only worked on one end of the truck, and I forget which end it was.

There's a thread on a Tahoe and Yukon site about a disc brake conversion. A pretty long thread, I think; but I haven't read it.

joe

Click to expand...

Yeah it’s the front brakes only back in the beginning.

I’m not sure if it’s the same on the gmt400 trucks, but on my dad’s 01 duramax the abs and parking brake light would come on. It ended up being that the abs control module was bad.