Mountain Bike Disc Brakes Squealing

Disc brake noise. How do I stop it?
I bought a mountain bike with shimano M485 Hydraulic disck brakes 6 months ago. The back brake has always made a loud squeal when I hit the brakes. I thought it would go away when they got broke in, but its still here. Now the front brake makes a slight squeal when I use it.
Any idea how to correct this?
clean pads and rotors with rubbing alcohol
eBike (Bionx) on paved trail
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Tektro Novela Mechanical Disc Brake, Front/Rear w/160mm Rotor. $48.00 Tektro Novela Mechanical Disc Brake, Front/Rear w/160mm Rotor. Cable actuated mechanical disc brake for use with linear pull brake levers (sold separately), fits front or rear ! Automatic Caliper Centering, dual pad adjustment & Automatic pad angle adjustment via floating plates ! High performance metal ceramic compound pads, . 160mm rotor, Black. Uses 460/3511 pads ! Light Weight – 176g Calip… |

