Cliffs
-I replaced my rear pads & rotors a little less than a year ago
-One of the new brakes was making scraping noises, found out the top shim was out of placement
-Readjusted, was fine for a couple days then started scraping again
-Ended up replacing the entire caliper shim
-Everything was great for a few weeks, then started making squealing noises when I would brake moderately. Light and hard braking = no noise.
-Finally got around to digging, saw some burnished bits on the shim where it was making dry contact with either pads or other shims, I regreased that area
-Now it squeals maybe 50% of the time as before

Anyone have experience with this? I greased enough but it's still apparently rubbing in that same spot on the shim. For what it's worth I used caliper grease on the shims rather than any brake quiet (pads came with some compound) does that really make a difference? Stupid question but if I let it go will the grease eventually settle where it needs to and the squealing goes away? I'm at a loss why freshly greased shims would be squealing. The squealing doesn't bother me as it's only momentarily, but I hope it's not fuking up my brake assembly.

My caliper is in the 12 o clock position and this is the shim that holds the pads downwards, the service manual calls it a "spring" rather than a shim tbh. It only comes from the brake I replaced the shim on. Can any mechanic brahs speak to this? Keep digging in and greasing it until it's gone completely? I can't imagine this thing would need so much fcking grease...

Did you bed in your pads?

are these brembos by chance? they drove me nuts. performance was out of this world but i don't go to the track anymore with the car (challenger w/ the 392).

basically they'd squeak almost all the time regardless of the situation. i kept the cool looking calipers but swapped the pads out for powerstop Z series and never heard a sound again.

Yeah the pads are/should be fine. I've had them on for quite awhile. Also from what I've read new pads don't really need to be bedded if the rotors are new, too.Brembo rotors but Hawk pads. I'm still positive it's one of the shims and not the pads, though.

Oddly enough as soon as I made this thread the screeching has been mostly absent. Lol....

Which Hawk pads?

I use DTC 70/60 on the track and they are atrociously loud when cold.

I'm not sure the model #, but they come in a blue box. I have Hawk pads in the front, came in a yellow box and they are perfect. No idea why there is a difference of color on the box when really the side of the pads is all that should be different. Meh.

either way forgot to update this but yeah it's the pads. For some reason the brake I didn't have to replace the shim on, started making the same squealing noise when moderate braking. So yeah, hopefully it's not going to do it the full life of the pads. I'm sure it will, tho,

screeching happens due to vibration, pad/disc material or excessive brake dust. Apply disc brake quiet to back of pads brake pads and see if it stops. this is why high end cars come with pads that have sticky shims on them.

Leave them alone if they are working LOL.





Porsche Creates Video to Explain Why Brakes Squeal (and Why It Doesn’t Necessarily Mean Something Is Wrong)

"Squealing brakes are as annoying when riding a city bus as they are when driving a sports car. But Porsche’s engineers want you to know that you shouldn’t worry, even if it is grating.

The German company has produced a short yet fairly thorough video on the subject, presumably so dealerships can send or show it to customers to mitigate complaints about the phenomenon.The narrator essentially offers two solutions: Accept it because Porsche brakes are the best in the world, or drive faster all the time.

The reality is that cold brakes in any car can squeal at low speeds. The pads and the rotors won’t reach operating temperature without repeated stops from moderate cruising speeds—or if they’re carbon-ceramic brakes, without hard pedal applications at much higher speeds.

The video relies on graphs, charts, 3D renderings, and other geeky stuff we love to make its point. It’s true that your neighbor’s 2006 Toyota Corolla probably doesn’t squeal as much when tooling around town as does a new 911.The bottom line on performance brakes fitted to any high-end car is that they tend to sacrifice aural refinement and long life in return for greater stopping power and feel.It’s a trade-off we’re happy to make."

https://www.caranddriver.com/news/a1...hing-is-wrong/