Question about 2000 Chevrolet Blazer

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I have a 1999 blazer. It was making a roaring noise in the front end. Took it to a garage. They replaced the passenger side wheel bearings. This cost around $400.00 for parts and Labor. When I picked the car up from the garage the ABS light was now on. I drove around the block and came right back to the garage. He hooked it up to a device and said that now the speed senser in the driver's side wheel bearing was bad and that now has to be replaced at the cost of another $400.00. Is there a reason why replacing the passenger side wheel bearing would immediately make the driver's side senser go bad or is this just a unusual coinsidence?

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  • janet0057 Mar 09, 2009

    The Blazer is 4 wheel drive. When I took my Blazer back, he plugged some type of hand held tester under the dash and said that it indicated a bad speed scenser in the bearings on the drivers side. (This was not the side they had just replaced.). I asked him why the ABS light was not on before they did the work on the other side. I was told that the ABS light was not able to come on to indicate a bad sensor on the driver's side because of the bad bearing on the passengers side. Only after the bad bearing was was replaced could the light to come on. I did not have the money to fix it just them. He assured me that the car was safe to drive until I could. So I am driving it now. However, sometimes the ABS light does out for 2 or 3 minutes when I am driving but always comes back on. During those few minutes that the ABS light is out, the anti-lock breaks engage at any NORMAL stop. This is very scary, as the car is difficult to stop. It makes the normal anti-lock break sound, the pedal will not go down all the way and it pulsates and the car pulls to the right. I feel that the mechanic may have caused this problem but I don't want to mistakenly accuse him either. I have only used this guy once before to replace a bad fuel pump. Any advise??

  • gordoe05 Mar 09, 2009

    I had the same problem more than once. Replaced passenger wheel bearing myself. Now ABS activates when I'm coming to a stop but the light has never come on. I need to replace the one I just replaced or hook up a tester to see if the other side is bad. At any rate, it was pretty simple to do and I paid $175 for the bearing at an auto parts store. My 2000 Blazer is a 4x4.

  • janet0057 Mar 11, 2009

    Thank you. I will have the dealer run a scan on the ABS light and see what he somes up with. Even if they charge me for the scan, it will give me peace of mind. I will update you once I know more. PS. I was told that the sensor is in the wheel bearing compartment and so the bearings will need to be replaced as well.They are to call me back tomorrow with a confirmed estimate.



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Ask them why it wasn't a problem before the work that they did in that area, and if it normally needs replacement because of bearing work done, then why wasn't it done, and why should you pay the labor to pull everything apart again? Call your local parts store or dealer for price on part, so you know what they're charging you for labor. If it's 2 wheel drive, ( gives an estimate of about $75-$100 for labor & $50-$75 for parts.? Something not right here! Have you dealt with these guys before?

Posted on Mar 07, 2009

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  • Mike Butler
    Mike Butler Mar 10, 2009

    First of all I apologize for low estimate, I was thinking 2WD, guess I shouldn't have assumed, we know what that does, only in this case, it was just me. With that said, in my experience, I have never heard of that particular line of bull before, but must admit, after researching & reading some articles on it, and experiences others have had with ABS systems, I have to take that back. Some incidences I came across, by experienced mechanics defy all logic & common sense when it comes to ABS systems, which leads me to say, anything is possible, but I just can't help feeling that something is very fishy here. I would call the local GM dealer, or reputable other shop, and ask them how much it would cost to scan your vehicle to confirm which ABS wheel sensor is faulty. If it says left front (drivers side), I'd take the time to pull that wheel & look for any sign of that sensor being removed, or grease rubbed off at mounting bolt which would indicate someone may have swapped it over, if they can be swapped over.(see what I'm getting at?) One other thing is, if you go that far, and no sign of anyone touching it, pull the connector to it, apart & spray it with electrical cleaner before plugging it back together, it may just be a bad connection. Keep me posted what you find. By the way, sensor only is about $70, labor $100 max. so is he still saying $400?

  • Mike Butler
    Mike Butler Mar 10, 2009

    P.S. If you pull the ABS fuse, you may feel more comfortable driving it for now. You decide what feels good to you. Just be careful to remember, now you have to ease off if wheel locks up when hard stopping.

  • Mike Butler
    Mike Butler Mar 11, 2009

    Yes, some require replacement of unit complete, I have found that out, but the GM guys can confirm that for you at same time too. Good Luck, keep me posted.

  • moorlando244 Jan 02, 2011

    If you were to hook a computer too the vehicle and drive it while watching the speed sensor readings you will see that usually at 5 mph, 1 of the sensor readings will go to zero, resulting in the anti-lock thinking the wheel is locked up ( ie as in on ice). Causing it to cycle and not want to stop. I have had the front wheelbearings on mine replaced 1 for growling sounds and 2 more times for wheel speed sensor malfunctions. With 144000 miles 8 wheel bearings, but I also live in the Buffalo New York area.



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