Question about 2008 Chevrolet Equinox

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Equinox brakes (amaurer1@nc.rr.com)

When applying brakes, barely touching them,while just coasting or at low speeds brakes act like they do whenever you have to apply in a hurry(which I've only had to do once,heard the noise,scared me to death)it's the type of brakes you have that you're not supposed to pump.dealership can't figure out.have had it 3 different times for about a week.the abs light came on and they said it was some type of speed sensor,replaced,but that's not solved the problem.i'm afraid to drive it.what if i hit someone,rear-end,automatically my fault ,i get ticket.husband at this wits end,ready for gm to buy it back.it's almost paid for.please help.i haven't seen on any website where someone's had this problem.

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  • Steven Brock May 11, 2010

    Take it back to gm dealer. This should still be under factory warranty. Tell them keep working on it. Yes your speed sensors will cause this though. But if they were changed, I'm not sure what the problem is. Sorry, I can't help more.

  • Tom Whitaker
    Tom Whitaker Apr 06, 2017

    I eorkrd for Chevy for 15 years and have come across the abs relay will actavate or not work period. The bad problem is the relay is built into the abs module and is hard to diagnosis. I had to keep the car and drive with a scan tool for a few days before finding it. Not saying this is your problem but this is something you can take to the shop.

  • Grayson Jones May 01, 2017

    Have you had a brake light switch put in it lately? If so it could be adjusted to tight putting pressure on the brake pedal

  • annonomous person
    annonomous person May 04, 2017

    Unplug the abs fuse and forget about it. Abs light might come on but better than wrecking

  • Alan Relder
    Alan Relder May 05, 2017

    If you apply great power to your brake pedal to stop immediately your brakes are supposed to jump and Paul said that is normal

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Firstly - your symptoms are not directly associated to any brake "failure". The noise is likely related to either a faulty sensor for the abs, the signal/information going to the abs controler is incorrect (not your basic brake function. If your ABS light comes on it is just telling you that the ABS system has been switched off. ABS is there for emergency situations. Your can still has brake function like you had befoore ABS was introduced. You have no need to be concerned as emergency stopping with normal brakes about town would rarely engage ABS. Your dealer "interogates" the ABS controler for fault reports. However, the fault needs to be apparent for this fault report to work. keepit until the ABS light comes on. WITHOUT switching the engine off take it straight to your dealer. switching of may dumpt the fault report so DON'T. Hope this helps.

Posted on Apr 28, 2017

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Wow, lots of advice, much off topic and some just flat out wrong. Take the car into a large, empty parking lot and do some emergency stops. If it stops straight, without pulling, YOUR BRAKES WORK and will stop you. The ABS system isn't that complicated to diagnose, you've been taking it to the wrong place. The throbbing of the brake pedal and noise is the ABS pulsing because it thinks one or more wheels is turning at a different speed. If sensors check out electronically, then it's in the wiring to each wheel or the ABS controller. The ECU should have codes stored that tell which sensor is sending the signal and lead to a repair.

Posted on May 01, 2017

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  • Chevrolet Master
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Have the car scanned for codes even if the check engine light is not on. Sound's like the antilock system is malfunctioning.

Posted on Apr 30, 2017

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Take it to a large empty parking lot and put it in reverse and drive as fast as you can safely then slam on brakes. A mechanic told me that this can adjust some brake problems and it's worked for me before. You may need expensive brake work done but always try the cheapest solutions first. Good luck!

Posted on Apr 30, 2017

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  • Anonymous May 01, 2017

    Great for adjusting the parking brake, but not real useful for the OP's issue.

  • annonomous person
    annonomous person May 04, 2017

    Sounds like a bad wheel abs speed sensor. Or make sure all of your tires are the same diameter. 4 wheel abs especially. Wheel speed coralation will cause that. Also a broken abs sensor wire.

  • erigon5
    erigon5 May 06, 2017

    just sounds like your brakes were not installed and bled properly

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Often times, the sensor gets replaced only to find that the wiring between the sensor and the ABS module has been damaged. Have them check that. There are wiring harnesses available that can replace the bad ones.

Posted on Apr 27, 2017

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Ok ABS all the brake lines go into one central unit , it looks like air has gotten into the system and it is very difficult to bleed it out . If you have had the brakes bled recently was the battery disconnected ? it should have been because the unit valves are closed when the battery is disconnected .

Posted on Apr 25, 2017

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Unplug the abs and see if that makes the difference if it does it's an abs issue I suspect it is. When it brakes hard does it pull to one side? If it does it's a wheel speed sensor which is part of r the abs system

Posted on Apr 25, 2017

  • Anonymous Apr 30, 2017

    Yeah I would pull the fuse for the ABS system. Then GM can figure out the rest...

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I had the problem after 60k miles on my '05 Equinox. In my case, the wire that connects between the drivers side front wheel hub sensor and the engine compartment harness was intermittently open. A replacement fixed that problem. The front passenger wheel hub wire failed at 164k miles and the same replacement corrected the problem. Constant repetitive flexing eventually opens one of the 2 wires in that little connector harness near where it rigidly anchors to the strut assembly. ABS doesn't like it when there is no input from one wheel intermittently, "growls" the metering module and flashes the ABS light on the dash. Best of luck with your repair.

Posted on Apr 24, 2017

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Have a shop scan for codes to determine if one of the wheel sensors may be a problem. Not saying the sensor is bad, but it will give you or them a place or location to start looking. You have 4.. one at each wheel. Check or have them check to see if there is any wheel bearing play. If there is play (looseness), replace bearing. If there is no play in bearing, check to make sure the abs sensor (wheel speed sensor) is free of debris and is not damaged. Either clean or replace depending on what you find. Check the reluctor ring. This looks like a ring with a bunch of teeth on it. It is sometimes found on either the axle shaft or part of the wheel bearing. If on the axle shaft, inspect the ring to make sure there is no split or Crack in the ring. This ring is what sends the speed signal and the signal is picked up by the sensor. If the ring is split or cracked, it will send an incorrect signal and cause problems. Sometimes there is excessive rust between the ring and the axle and it will split. Also checked that the ring is stationary on the axle and that it's not dancing out of place. Make sure that you have nothing blocking the signal between the ring and sensor. If you don't see the ring on the axle, follow the abs wire to see if it goes into the hub bearing. If the wire goes into the bearing then that reluctor ring is part of the wheel hub bearing and the hub bearing needs replacement. I hope this helps or gives you a direction in which to go. Good luck.

Posted on Apr 22, 2017

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Roy Beman
Is right on.BUT i have found that the rear hub bearing does the same thing.
I was able to record while driving at low speed a very slight off
of the signal causing an abs activation.
It was such a slight dip that you would miss it most of the time.
Most scanners with drive recording should be able to catch this
when you go back and review recording you should see a dip.
It will be quick like a snap of your fingers

Posted on Apr 07, 2017

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  • 39 Answers

Get a lawyer, if the dealer can't fix it then file a class action lawsuit to get something done about it. As vehicles are getting more electronically complex the mechanic needs more education into the electronics fields, but that is not happening, I know because I graduated from a technical school on auto technology but they really never had any training towards electronics, just the basic mechanical stuff, and I was actually teaching the teachers from my years of experience from learning on my own. As like several others said, it should be under warranty and even if not they still need to fix it or they will be sued for not complying.

Posted on Apr 07, 2017

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Have your power assist module checked, it's a common occurrence and frequently overlooked.
It is supposed to help you modulate brake pressure, but sometimes it turns into an on off switch and makes your brakes grabby.

Posted on Apr 06, 2017

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Super easy fix, replace the brake caliper that is sticking and bleed the brakes. If you do it yourself it should cost around $100 CAD. There are several DIY videos that will teach you how to bleed the brakes, just google it.

Posted on Apr 05, 2017

  • spdfrk Apr 30, 2017

    Make sure the caliper pins are well lubed.

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I'm assuming that competent technicians are diagnosing this problem and they performed the preliminary visual examination of all exposed ABS wiring for damage, wire retainer problems, wires rubbing other vehicle components, have looked for contamination, debris, etc in the reluctor areas{I have seen this type problem caused by metallic dust created be brake pads worn to the steel backing being magnetically attracted to the sensors/tone wheels. This debris confused the sensor}

This problem on GM vehicles has been caused by front wheel hub/bearing issues. Any looseness or play in the front bearing causes the distance between the wheel speed sensor and the reluctor(trigger wheel) to change, which in turn changes the sensor signal enough to cause the ABS control module to engage the ABS, This frequently occurs during low speed turning. The solution is to replace the hub and bearing(which contains the sensor)assembly.
A second issue is that in some cases the permanent magnet in a sensor can lose some of its magnetic strength, which causes the sine wave of the sensor to be altered, which can also cause the random ABS engagement you describe. There is no practical test of the magnetic strength that can be performed in the field, so again the replacement of the sensor.

Posted on Apr 05, 2017

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Posted on Jan 02, 2017

tripletauto
  • 1450 Answers

SOURCE: ABS

you have an abs sensor dropping out at low speeds which makes system see a wheel locking up,also if you have installed bigger tires you need to have abs reprogrammed as this amplifies the situation.

Posted on Aug 18, 2008

GM Elec
  • 1000 Answers

SOURCE: ABS light comes on

Per your description, I would suspect you have a faulty wheel speed sensor. Take you vehicle to your local Auto Zone or Advanced Auto and have the codes pulled for free. Write them down and let me know what they are and we can go from there.
Good luck.
Regards,

Posted on Mar 05, 2009

  • 2418 Answers

SOURCE: abs/AWD light on 04 venture

Have you checked the brake fluid level?

Posted on Jun 06, 2010

mabpest
  • 1152 Answers

SOURCE: ABS dash lite is on-Have

warped rotor or wheel cylinder bad wearing pads out

Posted on Jan 15, 2011

  • 376 Answers

SOURCE: I have a 99 Chevy

I would recommend looking at a couple of things.Take a look at the dust plate to be sure its not rubbing the rotor.Second make sure that your calipers aren't getting stuck in the out position.It might be beneficial to lube the caliper pistons to allow for free movement.If you have a floating caliper system then also lube the slide pins.And lastly make sure that everything as far as attaching hardware is tight.

Posted on Mar 13, 2011

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1 Answer

Where's is the fuse located for my brake lights on my 2007 Pontiac g6 and rear defrost fuse


Stop Lamps
your br
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).
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DTC B3903 Stop Lamp Relay Circuit DTC C0277 Brake Pedal Position Sensor Circuit
DTC C0278
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
Does the scan tool display DTC C0278 00?
Go to Step 3
Go to Testing for Intermittent Conditions and Poor Connections

3

Recalibrate the brake position sensor.

Circuit Description
DTC C0870
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake pedal position (BPP) sensor. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the brake position sensor. When the brake pedal is being applied, the BPP sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
Circuit/System Verification
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  2. ?‡'
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  4. ?‡'
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?‡'
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