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Thumping after Brake job

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Old Feb 25, 2017 | 11:01 PM
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Default Thumping after Brake job

I recently did pads and rotors on my 07 z51. Ebc rotors with carbotech pads from ampd.(great company btw). Now I any time I apply the brakes anything past 15-20% I get a thumping knocking noice that slows down as the car slows down. I can not seem to pin point if its a certain wheel.

Does any one have any idea what the cause for this may be or were I can start looking. There is no vibration or kick back in the pedal its just a very annoying noise.
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Old Feb 26, 2017 | 12:24 AM
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Originally Posted by blackz151
I recently did pads and rotors on my 07 z51. Ebc rotors with carbotech pads from ampd.(great company btw). Now I any time I apply the brakes anything past 15-20% I get a thumping knocking noice that slows down as the car slows down. I can not seem to pin point if its a certain wheel.

Does any one have any idea what the cause for this may be or were I can start looking. There is no vibration or kick back in the pedal its just a very annoying noise.
Are the rotors slotted?
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Old Feb 26, 2017 | 12:29 AM
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sounds like the rotor is hitting something , is there any chance one of the rotors had a defect on the surface...

since it slows with speed...its definitely rotation related....take it apart and see of there are any defects on the rotors.... i would think that with a thumping like that you might be able to see where two things are making contact.

any chance that theres some debris or something sitting under one of the rotors..
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Old Feb 26, 2017 | 12:31 AM
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i didnt even think of that.... the drilled rotors on my 540i are quiet under normal braking..but if i really clamp down on them i get like droning from the holes in the rotors.
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Old Feb 26, 2017 | 07:27 AM
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Originally Posted by Adam@Amp'dAutosport.com
Are the rotors slotted?
They are. I know ebc said they will make a little noise because of the wider slots but I though this was excessive and wanted to make sure there wasnt anything majorly wrong
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Old Feb 26, 2017 | 09:37 AM
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Over torque the rotor bolts? Warped rotor. Easily done.

But with no pedal vibration maybe not.

Last edited by Boomer111; Feb 26, 2017 at 09:38 AM.
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Old Feb 26, 2017 | 10:39 AM
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Originally Posted by Boomer111
Over torque the rotor bolts? Warped rotor. Easily done.

But with no pedal vibration maybe not.
Thanks! yea that was what I was thinking. I get no vibration at all. The car is solid when I get on the brakes it just makes noise.
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Old Feb 26, 2017 | 10:40 AM
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Did you replace the sliding caliper bolts and boots? They can bind up and cause issues.
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Old Feb 26, 2017 | 12:04 PM
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Originally Posted by timd38
Did you replace the sliding caliper bolts and boots? They can bind up and cause issues.
I did not replace them I did grease them. I was thinking about replacing all the boots and shims that the pads slide in.
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Old Feb 26, 2017 | 07:12 PM
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slotted rotors FTW
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