I wonder if it is because the Prius' regenerative braking system slows the car which means the brake pads are used less than a normal car.
Sounds like low pads. many have built in wear indicators that squeal to warn you.
Automatic transmission fluid does not squeal. You have a different problem. Brakes squeal, bearings squeal, and belts squeal. Fluids do not squeal. You had better take your vehicle to a mechanic.
At least inspect when you hear squeal. Base further work on what you see.
Due to dust getting in between pads and rotor
When they have rust on them or you need new ones. Go have them looked at
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.
hypothisies
hypothisies
Possible worn out brakes
Bad logic
theory
That depends on how, when and where it is squealing. For example, if the brakes squeal when applied, the brake pads are probably worn down. A squeal from the engine compartment whenever the engine is running could be a loose serpentine belt (especially if the squeal changes a little when you rev the engine).