Belt may be loose or glazed
The Squeal means its time to replace the Brake pads.
Pads worn out. Dust between pad and rotor. Leading edge of pad has 'feathered' and needs filing off. Pads fitted without anti-squeal shims.
Due to dust getting in between pads and rotor
You can try but the squeal will probably come back. Brake squeal is usually due to cracked, glazed, contaminated or inferior brake linings.
The most problematic cause is that if your brake pads/shoes are worn down to the changing point. Other causes can be that your rotors/drums are glazed (due to overheating) and or simply brake dust and other road debris.
first of all, the pads may be semi-metallic and have chunks of metal in them which may cause the squeal, change to a less metallic pad may help, also the backing of the pads should have an anti-squeal gel applied to them, when you apply the brakes, the pads will hyper vibrate and can cause a squeal. The gel will stop the vibrating. first of all, the pads may be semi-metallic and have chunks of metal in them which may cause the squeal, change to a less metallic pad may help, also the backing of the pads should have an anti-squeal gel applied to them, when you apply the brakes, the pads will hyper vibrate and can cause a squeal. The gel will stop the vibrating.
Sounds like low pads. many have built in wear indicators that squeal to warn you.
There are three primary causes for brakes to squeal when applied. 1. Most often brake pads and rotors become glazed from continuous heavy traffic stop and go driving. Glaze can be removed with light sanding of the rotor but that is only a temporary resolution. If you continue the same driving habits, it would be wise to invest in ceramic brake pads. 2. Most cars and light trucks come from the factory with metallic bonded brake pads that have a wear indicator made right into the pad. When the pad needs to be changed it will squeal. And yes, brand new brake pads can squeal but that is largely caused by #1 glaze. 3. If you hear a squeal and a metallic grinding noise, the brake pads are completely shot and the caliper is doing the braking against the rotor. A brake pad that has worn this far has caused caliper and rotor damage. At this point the entire brake assembly will need replacement. Depending on the vehicle this could cost anywhere from $300 to $500 per wheel at a shop, and that translates to $600 to $1,000 for new front brakes only.
If you know for sure that the pads are ok, then it is may just the pads. Some metallic pads do seem to squeal on certain vehicles. You can try removing the pads and applying an anti-squeal to the back of the pads and all mounting surfaces. Be careful not to get any on the pad surface or the rotor. If that does not work, you will need to switch to a different type pad.
If the brake pads come with shims or other anti-rattle hardware and it is not used on the vehicle, the brake pads will vibrate against the rotor as they are being applied and that will cause them to squeal.
Check your belts for tightness or glazed edges. If the belts are loose, tighten them. If the edges are glazed, either break the glaze with a piece of scotch brite or replace the belts if they are worn.