Guyz I replaced the brake pads (all four) myself cause it was making squeaking noise when I brake. I replaced the worn out pads with an OEM set of Lexus/Toyota brake pads.
Ever since I got them replaced it starting making repetitive "vic vic vic vic" noise when I drive into parking lot. This happens when brake is not applied. When brake is applied the noise goes away. At high speeds it's hardly noticeable probably cause of wind/road noise is greater. Found out that the noise has been coming from the right front brake.
So I watched youtube videos and did some google search for causes for brake squeaks.
Ah! I need to grease the brakes more!
So I removed the brake caliper slider pin, anti-rattle spring, and brake pads. I removed the brake shims and decided to not put them back on cause the metal hooks on the edge were broken off. I greased all parts (slider pin, anti-rattle spring, backside of brake pads and around the edge). Put all the parts back together and test drove. The squeak "vic vic vic" went away... but now I hear metal to metal knocking sound. It's a lower pitch sound, and makes this noise when brake is NOT applied. This is really annoying. I was worried that maybe one of my brake caliper pistons seized or gone bad and therefore the brake pads aren't seating properly? This would cost me a lot of money to replace the whole thing.
Before I went about giving up I made one last try by putting the shims back together..... Greased them real good all moving/rubbing metal contact or friction points in the brake just like I did last time.
I test drove again and finally the knocking noise gone! No squeaks, no "vic vic vic", no knocking!
I will report back for an update if the noise comes back or not. so far so good