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Knocking while braking

My '05 malibu has a knock/rattle sound when I brake. I know the front rotors are warped, but this is more than just bad rotors. all of the boots in the front end are not cracked or broken and the bearings seem fine.
53000 miles

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Warpped rotors can cause alot of funky noises/ vibrations, while driving...make it feel like the car is comming apart, esp while braking....Sounds like it might have damaged the piston in a caliper if you hear a rattle sound...Def take it to mech..Brakes are no joke to wait and see what happens.....If you can, take off wwheellss and remove the caliper, inspect it well...teake the rotors and get new ones, put them on after you clean them( yer new ones) bleed the system if it needs and see if it does it still, if so then its either a caliper/master cylinder [problem...Or you have front suspension damage...let hope for now its just t he rotor!!!! Good luck friend!

Posted on May 23, 2009


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Lots and lots of things can do this. I would recommend having the knocking sound investigated as the main concern, possibly by a good front-end shop. It could be a c-v joint or bad hub bearing which can allow a wobble in the front brake rotors. This would allow what you call a "judder".

Sometimes rust can form on the brake rotors while the car is parked. This is a weather related problem and if rust is the cause it can wear off to a smooth surface with driving. But a badly pitted rotor will need resurfacing or replacing. It can produce a scuffing sound, but not a knock.

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It sounds like the rotor (brake disk) is warped. That would cause the pads to wear much more quickly because the disk "wobbles".
The warped disk can also cause the noise, depending on how bad the warp is.
When most shops change pads, they usually recommend that you "turn" the rotors, it is a way of truing the disk.

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