Because your brakes, when applied, "straiten" the rotor (disk) from a cockeyed angle. To put it simply, your wheel bearings are worn and while driving, the rotor, wheel and tire are at a slight angle. The "wear indicators" (a small piece of metal attached to the pads on the top) built into the brake pads are temporarily rubbing against the rotor. When you apply the brake, it temporarily returns the group back to where is should be as if it were new, stopping the indicators from touching the rotor.
Thought i should add that if your wheel stops squeaking when you depress the pedal it is usually a sign of ball-bearing wear. The wheel will squeak through braking if the brakes are done, or worn.
That could be the brake pad "squealers". They are designed to squeal when they are worn out. Time for a brake job.
Answer: If its a high-pitched squeak, it sounds like the wear sensor on the inner brake lining.
On all the brake pads which are made, they make them where they will begin to squeak if they need to be replaced. If they are squeaking then you need to get them checked immediately.
Why do brake pads squeak after replacing pads?
When Exhaust brake is on squeak noise comes from the engine?"
There is a small metal warning devise that rubs against the rotor when the pads are worn out. Replace your brake pads immediately. Failure to heed this warning will result in the rotors being destroyed.
Brake pads may be worn down to the brake "squealers".
your e-brake is out of adjustment
Could be many things, such as as wheel bearing or tire, but most often it is the little warning clip rubbing on the rotor indicating that your brake pads are worn.
Generally new pads will contain a layer of dust which causes the initial squealing. The squeal should go away after a bit if driving.
squeaky sounds that go away when you push the breaks are most probably the indicators on your brake pads that squeak to let you know that they are getting worn out and need to be replaced soon also dirty brakes will chirp while driving, a thorough cleaning and lube of the proper parts usually cures this There are typically metal tabs on your brake pads that are meant to squeak when your pads start getting low. It is possible that is the cause of your squeak, check your pads, or have a mechanic check, as this is a good possibility, however not a definite.
need new rear brake pads.