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Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

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Old 08-16-2019, 03:38 PM   #1 (permalink)
hhiibel1
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Braking issue at low speeds.

My issue has been coming on for about 8 months. Coming to a stop under gentle braking as the speed gets very low i feel what I thought to be warped front rotors. I've replaced them months ago and the condition continues and is becoming more pronounce. I don't sense a feedback thru the pedal. It doesn't pull to one side. Brake and steering fluid are full. I do have seeping on all things hydroboost. I'll clean and report where. To recap, at 10mph and getting lower there is a slow, cyclical rythm to the strength of the braking. the slower the more pronounced and it seems rotational related. As I get slower it gets slower. thanks. hh

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Old 08-16-2019, 05:02 PM   #2 (permalink)
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Could you update your sig to indicate what truck you have, along with any options and modifications are on the truck.

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Old 08-16-2019, 05:11 PM   #3 (permalink)
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As member davester mentions when you complete your user signature with vehicle info it will appear with each post you create and will assist the other members when giving you any diagnostic or repair advice.
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Old 08-16-2019, 05:12 PM   #4 (permalink)
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WSS (wheel speed sensor) in one of the front wheel hub assemblies is lifted up by rust, or a front hub assembly is worn out (sloppy).
You are getting unrequested ABS activation because one of the two front WSS is not sending a proper signal at low speeds.

Unplug either front WSS behind the shock tower and then test drive. Problem gone? If so, you still need to determine which side is bad.

When you unplug either WSS, the ABS light will come on when started. It will remain on until you plug back in, restart, and drive above 20 mph.

Scanning for codes won't reveal anything. Monitoring wheel speeds with a scanner, while slowing from 20mph, will reveal which signal drops out early.

My threads on the matter are best found using the terms "Achilles Heel" here on dieselplace.
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Old 08-16-2019, 05:57 PM   #5 (permalink)
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My apologies. 2008 3500HD duramax.
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Old 08-16-2019, 06:07 PM   #6 (permalink)
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thanks. sounds likely. will search for you posting.
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Old 08-16-2019, 06:12 PM   #7 (permalink)
davester
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Could you add that info to your sig (which is currently just "doubleH"), so it's automatically included with your posts?


Anyway, given that you say the pulsing is pretty slow, and varies with vehicle speed, it doesn't sound like the abs system coming on, as that uses a relatively constant, fast pulsing to perform abs braking.


Maybe it's one of the rear rotors that is warped, or something is on one of the rotors so it doesn't grab as much on one section of it?
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Old 08-16-2019, 06:24 PM   #8 (permalink)
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new rears also.
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Old 08-16-2019, 06:32 PM   #9 (permalink)
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searched for achilles by heymccall. found two. this and another. the other said also search for sliding on ice. which returned same. just was hoping to find more info on remedying this sensor issue. thought i saw something about location and cleaning up. but can't find now. guess it will be obvious once i get into it. thanks.
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Old 08-16-2019, 06:33 PM   #10 (permalink)
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haha. from 32 plugs to gears....one moment.

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