Question about 2006 Chevrolet Silverado

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Had both rotors ,pads and emergency brake pads changed on my 2006 ,2500hd silverado, now after approx 12000 miles i get a loud noise that is more than a squeek more like a loud growel, then a squeek just before it stops, this only happens at speeds less than 30 and after heavy stopping and starting in city traffic. normal country driving there is no problem , but once in awhile when truck first moves .

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  • chris_fox325 Mar 28, 2011

    i know what your taling aboput with the pulsing i do not get that and have had that problem repaired once 2 yrs ago , this problem is only when braking in city traffic and under 30 miles per hour

  • chris_fox325 Mar 28, 2011

    ok but the noise would then becoming from the front of the truck not the rear in that case or am i wrong in thinking that the ABS pump is under the hood?

  • chris_fox325 Mar 28, 2011

    yes i now have more info to diagnose this problem



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If the problem is brake-related, as it looks from description, check brake system, ABS, and front rotor hub. Double check the new pads and rotor.

See if any of the new rotors is worn irregularly. In that case you will need to check caliper and rest of the brake system.

If you get noise and kind of pulsating on pedal when braking at slow speed the problem is the ABS. In that case the ABS pump is kicking too early because of a defective speed sensor. GM trucks have the speed sensor built-in with the front wheel bearing hub.

The noise while restarting can also be a faulty ABS pump. In that case the vehicle will run normally, usually you are able to tell if there is a locked brake.

This truck has several common troubles involving the brake system. Check brakes and front train, if everything is OK check ABS pump and system.



Posted on Mar 28, 2011

  • Ginko
    Ginko Mar 28, 2011

    Since you already replaced the rotors, the fact that the problem happens in conjunction with breaking, and only at determined speed lets think that the problem is the ABS. A defective ABS pump can make noise.

    If brakes are not locking up the problem is likely ABS pump.

    If brakes stay locked the problem is not the ABS pump, but the brakes themselves.

  • Ginko
    Ginko Mar 28, 2011


    The pump motor for this truck should be located below the driver door, behind the frame rail. I have never seen an ABS pump making noise, other than when blocking and defective. The pump is still a motor and can surely make noise. Have a look and check when problem happens.

    Far more commonly the brakes may be locking up. In that case you need to check the brake system. Usually you can tell if brakes are locking up. In that case a possible failure is the brake pressure modulator valve (BPMV), which is also part of ABS.



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