Question about 2000 GMC New Sierra 1500

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Grinding and rattleing sound on the brakes of a 99 Gmc Sierra

I have a 99 gmc Sierra 1500 z71 i have noticed a rattling noise in the front end and when i brake there is a grinding noise and the brake seems to not want to grab right away and we have checked the rotors and pads they seem fairly new. The other day my husband was going in reverse and the brake paddle went all the way to the floor. When the brake paddle hesitates you can feel it on your foot that it is trying to grab. What could be causing this?

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  • contrerasjea Jul 13, 2009

    We did try that and still have the same problem.. It feels weird whenu step on the brake u can feel likethe brake trying to grab and then slip and grab

  • contrerasjea Jul 13, 2009

    Ok, NOW the truck's brakes got real hard and i couldnt brake at all.!! i had to push real hard to get the trcuk to finally stop .. coule the break caliper be going bad ?


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If the brake peddle went to the floor it is indicating either a faulty master cylider or there is a breach in one of the brake lines. check the brake fliud for a low level and look for any leaks around the complete area of the ground under the truck for a stained road surface this will point you in the right direction inregards to where the rusted brake line or broken rubber brake hose is located, as for a grinding sound when applying brakes sometimes the inner pad and rotor surface is hard to inspect because the veiw is obstructed by the splash guard on the inner side of the rotor and brake caliper/pad assembly, the only effective way to check the rotors and pads is to remove the calipers and inspect, some guys use a small flashlight to peer through the small gap in between the caliper an spash shield to try to see the condition of the back surface of the rotor I don't prefer this method I like to be thourough. By the way a simple test to check the master cylider is as follows, with truck in park and engine running slowly agently push the brake pedal down if it goes nearly to the floor the master cylinder needs replacing especially if the brake fluid reservoir has not lost any fliud.

Posted on Jul 13, 2009

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Air in the brake lines can cause that, bleed the brakes out, not very difficult if u know anything bout brakes, i can give u steps if u dont know how

Posted on Jul 13, 2009

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