ABS comes on at every stop - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Oldriginal86 · 07-30-2013, 09:47 PM

This is my first post on this forum.I am usually on the 73-87 side. I have a 98 K3500 SRW. 7.4 with a 4L80e. My question is after setting for about a year,it failed emissions test, finally made repairs and ready to get it retested. On the road test the brake pedal felt normal however the ABS motor came on each time the truck was slowing to a stop. Plugged in Solus tool. It showed an abs stop every time.These were not hard braking stops, just moving in the driveway it would come on. Want some ideas before I spend more money on this thing. Truck only has 85K miles as I only use it to haul stuff to the dump and pull my boat. Thanks in advance.
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4x4toy · 08-01-2013, 10:03 PM

With the solus scanner you should be able to monitor wheel speed. Look for a speed sensor going to zero before the others. I am willing to bet you have rust particles stuck on your front speed sensors. The rust particles fell from your rotors as they sat for a while, the sensors attract metal. Clean them and retry.
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Oldriginal86 · 08-01-2013, 10:43 PM

Looked at wheel speed. It measures LF , RF and rear. They all seemed to be reading the same. I don't have a lot of experience with the Solus tool. With the truck not moving it read 3mph on all sensors. Not sure if this is correct. You are correct about rust on this truck, I plowed with it for a few years. I will pull the front wheels this weekend. Where is the rear sensor located since it only shows rear wheel speed and doesn't differentiate between left and right. Does it just use the VSS in the trans. ? Thanks for the help.
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4x4toy · 08-02-2013, 04:00 AM

Rear sensor is most likely in the rear axle, mounted on the top of housing inline with ring gear. You will need to drive the truck and have someone watch the speed readings. Some vehicles will show 3 mph while sitting.still, not an issue.
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4x4toy · 08-02-2013, 05:06 AM

Looking at wire diagram for your truck, rear wheel speed uses the sensor mounted on tail shaft housing on transfer case. That sensor is usually reliable. If it is giving problems your speedometer will not act right as it shares the signal with that.

After looking at some info on your truck, your front sensors are not exposed to rust like I was thinking. Front wheel speed sensors are mounted on the hub bearing assemblys. You now will have to find the readings for wheel speed sensor with scan tool and have someone drive it while you monitor the readings, look for speed sensor dropping faster than the others.

OrangeAnimal · 08-02-2013, 09:41 AM

Another thing to note. If your wheel cylinders are leaking or your rear brake lines have air in them it will do the same thing. Mine did it after sitting for a few months in my garage. I pulled the drums and the wheel cylinders were leaking. Replaced the cylinders and some hardware as mine was rusty too. Now it works fine again.

You can clean the sensors and the the rest of the parts. Check those the rings on the drums if they get too rusty it won't work right but I would be looking at a mechanical failure first.

Go over the basics first. Also if you have a speed sensor problem or a abs problem the abs and red "brake" light would stay lit in most cases.

Oldriginal86 · 08-02-2013, 08:14 PM

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Oldriginal86 · 08-02-2013, 08:20 PM

Would pulling the ABS fuse/relay disable the system. That way I could feel how the truck stops without it. I have in the past replaced both front calipers and pads but never pulled the rear drums off to check shoes and drums. Might be time to do a little general maintenance.
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ChevyTech · 08-03-2013, 10:12 AM

http://67-72chevytrucks.com/vboard/s...d.php?t=386380

07-30-2013, 09:47 PM	#1
Oldriginal86 Registered User Join Date: Apr 2013 Location: Pasadena, Maryland Posts: 160	ABS comes on at every stop This is my first post on this forum.I am usually on the 73-87 side. I have a 98 K3500 SRW. 7.4 with a 4L80e. My question is after setting for about a year,it failed emissions test, finally made repairs and ready to get it retested. On the road test the brake pedal felt normal however the ABS motor came on each time the truck was slowing to a stop. Plugged in Solus tool. It showed an abs stop every time.These were not hard braking stops, just moving in the driveway it would come on. Want some ideas before I spend more money on this thing. Truck only has 85K miles as I only use it to haul stuff to the dump and pull my boat. Thanks in advance. Posted via Mobile Device

08-01-2013, 10:03 PM	#2
4x4toy Registered User Join Date: Jan 2009 Location: Southern Md Posts: 228	Re: ABS comes on at every stop With the solus scanner you should be able to monitor wheel speed. Look for a speed sensor going to zero before the others. I am willing to bet you have rust particles stuck on your front speed sensors. The rust particles fell from your rotors as they sat for a while, the sensors attract metal. Clean them and retry. Posted via Mobile Device __________________ 04 Yukon XL 2500 w/ Quadrasteer 61 Chevy C60, 261 inline six 86 Chevy C20 2wd, Banks 6.2 05 GMC Sierra 2500hd Duramax

08-01-2013, 10:43 PM	#3
Oldriginal86 Registered User Join Date: Apr 2013 Location: Pasadena, Maryland Posts: 160	Re: ABS comes on at every stop Looked at wheel speed. It measures LF , RF and rear. They all seemed to be reading the same. I don't have a lot of experience with the Solus tool. With the truck not moving it read 3mph on all sensors. Not sure if this is correct. You are correct about rust on this truck, I plowed with it for a few years. I will pull the front wheels this weekend. Where is the rear sensor located since it only shows rear wheel speed and doesn't differentiate between left and right. Does it just use the VSS in the trans. ? Thanks for the help. Posted via Mobile Device

08-02-2013, 04:00 AM	#4
4x4toy Registered User Join Date: Jan 2009 Location: Southern Md Posts: 228	Re: ABS comes on at every stop Rear sensor is most likely in the rear axle, mounted on the top of housing inline with ring gear. You will need to drive the truck and have someone watch the speed readings. Some vehicles will show 3 mph while sitting.still, not an issue. Posted via Mobile Device __________________ 04 Yukon XL 2500 w/ Quadrasteer 61 Chevy C60, 261 inline six 86 Chevy C20 2wd, Banks 6.2 05 GMC Sierra 2500hd Duramax

08-02-2013, 05:06 AM	#5
4x4toy Registered User Join Date: Jan 2009 Location: Southern Md Posts: 228	Re: ABS comes on at every stop Looking at wire diagram for your truck, rear wheel speed uses the sensor mounted on tail shaft housing on transfer case. That sensor is usually reliable. If it is giving problems your speedometer will not act right as it shares the signal with that. After looking at some info on your truck, your front sensors are not exposed to rust like I was thinking. Front wheel speed sensors are mounted on the hub bearing assemblys. You now will have to find the readings for wheel speed sensor with scan tool and have someone drive it while you monitor the readings, look for speed sensor dropping faster than the others. __________________ 04 Yukon XL 2500 w/ Quadrasteer 61 Chevy C60, 261 inline six 86 Chevy C20 2wd, Banks 6.2 05 GMC Sierra 2500hd Duramax Last edited by 4x4toy; 08-02-2013 at 05:17 AM.

08-02-2013, 09:41 AM	#6
OrangeAnimal Registered User Join Date: Jan 2009 Location: New Orleans, LA Posts: 702	Re: ABS comes on at every stop Another thing to note. If your wheel cylinders are leaking or your rear brake lines have air in them it will do the same thing. Mine did it after sitting for a few months in my garage. I pulled the drums and the wheel cylinders were leaking. Replaced the cylinders and some hardware as mine was rusty too. Now it works fine again. You can clean the sensors and the the rest of the parts. Check those the rings on the drums if they get too rusty it won't work right but I would be looking at a mechanical failure first. Go over the basics first. Also if you have a speed sensor problem or a abs problem the abs and red "brake" light would stay lit in most cases. __________________ 82 Chevy SWB "OrangeAnimal" Lot of Goodies! Sold 93 GMC 1500 "Angry Red" 383 TBI Powered Fun! 300hp/410ft.lbs. 09 Yaris wife's daily.

08-02-2013, 08:14 PM	#7
Oldriginal86 Registered User Join Date: Apr 2013 Location: Pasadena, Maryland Posts: 160	Re: ABS comes on at every stop Posted via Mobile Device

08-02-2013, 08:20 PM	#8
Oldriginal86 Registered User Join Date: Apr 2013 Location: Pasadena, Maryland Posts: 160	Re: ABS comes on at every stop Would pulling the ABS fuse/relay disable the system. That way I could feel how the truck stops without it. I have in the past replaced both front calipers and pads but never pulled the rear drums off to check shoes and drums. Might be time to do a little general maintenance. Posted via Mobile Device

08-03-2013, 10:12 AM	#9
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: ABS comes on at every stop http://67-72chevytrucks.com/vboard/s...d.php?t=386380 __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.



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