ABS causing low-speed brake pedal pulsing - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > Brakes

Brakes Performance Brake Upgrades

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  #11  
Old 08-28-2009, 11:02 AM
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Blazernut Blazernut is offline
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Quote:
Originally Posted by davenay67 View Post
Hey dmince,

I know for sure my problem is related to the ABS sensor, the problem ceases when the ABS sensor in the hub bearing is unplugged from the main harness.

Given the age of the bearing and the build up of crud, I am waiting for the iminent demise of the bearing to finally cure this issue.

If I were you, I would definitely change your fluid and bleed your brakes. You may experience good results by undertaking this maintenance, so try this and see how things work after this.

Dave.
I wouldn't wait. I would have had this fixed yesterday.

Quote:
Originally Posted by WOOLUF1952 View Post
You have 110k on the original brakes?!? As Ray said, pull the ABS fuse and see if the pulsing goes away.
That's what I was thinking. That old fluid is probably not doing anything good to the brake system at this point.
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  #12  
Old 09-13-2011, 11:31 PM
idahomike idahomike is offline
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I'm also having the same ABS issue when coming to a stop on my 2003 Trailblazer. I replaced the drivers side half shaft. In the process, being new to cars with ABS, I used a C clamp to push the brakes piston can in (about 1/8") so I could get the caliper back on. After putting it all back together, my brake waring idiot light came on and the dashboard readout says service brake system. I've heard I messed up my ABS system. I bled the brakes, and that stopped the two warning lights from coming back on, but the ABS keeps rapidly pulsing the pedal when stopping once the car gets below 10 mph. I read the information above, and took out the fuse for the ABS, and the pulsing stopped (ABS and both brake warnings mentioned above came on). I pulled the drivers side ABS sensor off the hub and cleaned it and the rotor it senses. I have not cleaned the passanger side sensor yet (yes I took it out to when working on the drivers side half shaft to get the intermediate bearing assembly off). Is there an ABS valve that I messed up by pushingb the brake fluid backwards through the system? Where is it if there is? If it is the ABS sensor on the hub, how do I diagnose which one is bad? Can you jack the car up (all 4), take a sensor out and try the brakes to see if pulses? Or do I need to plug the hole, and take the car out for a test drive? Is there an easier way to diagnose what is wrong? Thanks, Mike
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  #13  
Old 09-16-2011, 11:10 AM
Doc Brown Doc Brown is offline
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Well, I started reading the thread and then realized that you replied to a 2 year old thread with a new issue. No offense, but that kind's kind of annoying.

I've been compressing the caliper pistons with a C clamp on ABS for years without problems. I was taught many years ago, before working on brakes with ABS, to pump the brakes 5 or 6 times until the pedal is rock hard. This is with the ignition off. I'm not sure if you did that, but it sounds like you didn't. Are you getting an ABS malfunction light?
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  #14  
Old 09-16-2011, 12:16 PM
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Mooseman2 Mooseman2 is offline
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There's another recent thread with the exact same issue. Turned out to be a bad bearing hub. Possibly yours got tweaked when you removed the axle from it. I would replace that one first. If still doing it, replace the other. Could just be a coincidence.

Yeah, zombie threads. You should have started a new one
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  #15  
Old 07-07-2013, 03:26 PM
The Moderator The Moderator is offline
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ABS Problems - Wheel Bearing Hub Assy. WIth Sensor

You can buy a new hub bearing assembly WITH sensor WITH shipping costs included for $65 at 1AAuto.com. Why spend $200 worth of time trying to avoid a $65 expense?
.
I don't recommend haphazard, random parts replacement, but a new assembly is necessary between approximately 150k - 185k miles anyway.
.
Also, just like brakes or tires, it is best to bite the bullet and replace both front bearing assemblies at the same time.
.
While an auto forum may not seem like the place to quote Shakespeare, "A coward dies a thousand deaths. The brave die once."
.
Die once and be done with it.
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  #16  
Old 07-07-2013, 06:04 PM
Pittdawg Pittdawg is offline
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Can anyone confirm that the 1AAuto wheel bearings and hubs are decent quality?
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  #17  
Old 05-22-2019, 10:01 PM
greck48 greck48 is offline
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2004 Chevy TrailBlazer SS (LS)
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brake pulsing

i have read that the sensor may have some crud buildup on it, & that cleaning
it may help. I have this issue with my 04 tb, but haven't tried clean it yet.
greck48
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  #18  
Old 06-21-2019, 12:46 PM
greck48 greck48 is offline
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+low speed brake pedal pulsing

I have this issue on my 2004 trailblazer also, makes a funny sound just b/4
stopping. I think it started shortly after replacing the left front hub bearing.
right hub was replaced about 1 year b/4. wonder if it's a cheap replacement
that doesn't pick up correctly.
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