I have already replaced the rotors pads and caliper and it still makes noise. i had a suggestion from a friend that it could be a wheel bearing or possibly the brake booster. the noise doesn't happen every time the brakes are pressed but as time goes on it becomes more frequint
The brake booster is not connect to the wheels. More likely is that the oe or more of caliper slides are jammed with rust. If one usually the lower one) is jamming, the caliper twists on the rotor and the pads make all sort of rattling or squeaking noise. A worn wheel bearing allows the pads to be pushed away from the rotor: a mushy brake pedal or grinding noises are the common result.
SOURCE: NOISE IN THE FRONT LEFT WHEEL ON A 1999 SUBARU
if the front brake pads,rotor and more importantly the caliper were all installed correctly, this noise is probably a front hub bearing that is failing. they will start a humming noise and then a roaring/growling noise the worse they get. is the noise rotational? by that it will get louder and higher in pitch as you increase the vehicle speed. get it checked out right away to avoid possible further damage.
SOURCE: Hi. I own a 1997 Subaru Impreza Outback. The
Good Evening, your problem is a normal wear and tear issue as that over time brake rotors can become slightly warped and the only time you feel it is when you step on your brakes. A normal rule of thumb on those systems is if you feel it in the steering wheel when you step on the brakes it is your front rotors, and if you feel it in your seat it is the rear rotors. Always change your brake pads at the same time you change your rotors to help the longevity of the brake pads. Glad to help.
Thanks,
Joey
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