I recently purchased a 2011 Lexus IS 250 (YAY!, I'm finally apart of the Lexus Family!), and decided to change the front brakes as they were depleted. The rotors still have some life in them but plan on changing them in the near future. Ever since I changed the brake pads, I've been hearing this scraping sound a lot more. Sometimes its heard when I accelerate, slow down, and braking. There's been a couple times where my car "jerks" or "struts" when braking. The other thing I noticed was, if I'm going ~60mph and I let my foot off the gas, my velocity is almost instantaneously reduced by a ~10mph. You can feel it slow down as instead of it "rolling down a hill or flat road".

The brake pads I purchased were: Duralast Gold Ceramic Brake Pads DG908

Did I install the brake pads wrong, or is this the result of bad rotors, or is the problem something else?

Here's the link to the sound:

https://imgur.com/IN3Ladf

 

First thing first, did you bed-in the new pads?

https://www.powerstop.com/brake-pad-break-in-procedure/

 

I didn't really break them in since they're not performance brakes/rotors but they have enough usage to be considered "broken-into".

 

If you coast to a stop from a sustained 60mph and reach in touching the wheel, hub, caliper and last but least rotor and can't keep your hand on it, something is wrong.

Bleeding the brakes removes air and reduces brake drag. Air expands when hot and induces more drag. That said, fluid should be replaced every 3 years max as it attracts moisture. With moisture comes corrosion and component damage. Replacing the fluid prevents this and extends the life of everything.