It is a "feeler" in the brakepad system that rubs against the rotor when the pads are worn out to a certain point. It serves as a warning or reminder that the brake pads are worn and need to be replaced before any damage is done due to badly worn-out brake pads.
Inspect the brake pads. They are probably worn out and need replacing.
this is usually the indicator that you need new brakes so dont worry just get them replaced problem solved
they are horny
Most times, the squeaking and rubbing noises are caused by brake pad wear, but you say the brakes are fine. Otherwise, if by constant rotation speed you mean the squeaking/rubbing noise is present even when the brakes are not applied, you might want to get the wheel bearing inspected
1. replace brake pads.
If it is a Toyota, they do not know how to fix the squeaking brakes either. Even after replacing all the pads and machining the rotors and rear drums
Sometimes things such as sand will get into your brakes and cause the squeaking noise. In other instances, it might something mechanical beginning to fail. Regardless of the cause, if the noise continues you should see your mechanic!
rubbing from brakes or rubbing from frame
One word for you...Brakes.....
Usually it is the brakes that needs servicing.
Vibrations that come through the breaks squeaking can cause the irritating squeaking that we have come to know. The high frequency of the vibrations results in the high pitch squeaking. Alternatively, the squeaking can come from the disc that secures the brakes, when the vehicle is coming to a stop.
Your brakes are either wet from the rain that has gathered within your wheels, or you need new brakes!