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Loud Thunking Noise When Braking

This is a discussion on Loud Thunking Noise When Braking within the General Help forums, part of the LSx Technical Help Section category; Whenever I brake repeatedly, I get a grabbing thunking noise from under the car. It is not subtle, rather loud. ...

  1. #1
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    Loud Thunking Noise When Braking

    Whenever I brake repeatedly, I get a grabbing thunking noise from under the car.

    It is not subtle, rather loud.

    Has been getting increasingly worse over the past year.

    Thoughts?

  2. #2
    Yo Da Lin The Valley..... astyles's Avatar
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    torque arm bushing?...........i had a caliper come loose also and it made a clunk sound,but it fell off before a year...

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    Member Mr Z's Avatar
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    Yea I had a clunking noise in the front of the car whenever I'd brake for the first time in a new direction (such as backing out a spot and stopping to go forward). Turned out it was a loose caliper bolt that i neglected to tighten.

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    Thanks for the replies...

    Without getting under the car yet...When I start/travel in reverse, I hear the thunk. Not when I go forward. When I brake going forward, I hear the thunk. When I start/travel in drive, I do not hear the thunk.

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    Member Mr Z's Avatar
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    That's exactly what I would hear. I'd back out of a spot and when I slowed down to go forward, it'd clunk. and then when I'd start driving forward and slow down for the speed bump in my apartment complex, there'd be another one. But afterwards I wouldn't hear another one until it came time to back into my spot. I had it clunking for a while before I found it. Even had the dealership look into it and started telling me all this bs about having a crack in my lower control arm (which I sure couldnt find...) and to let them replace it. But I tightend my caliper bolt and it has been gone for over 4 months.

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    Ha! Found the problem...for now.

    The two bolts that hold the torque arm to the differential were loose. Overlooked it.

    All well now! Thanks!

    Will be replacing the bushings though soon.

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