Brake disc noise.

[RUChris]

My front discs have started to squeal at low speed or when nearly stopped. At high speed I have no problem at all. There is no judder, and I have even tried new pads. Plenty of copper grease applied to back of pads, but still they squeal. This is driving me nuts, I am even considering new discs. I even tried cleaning the discs and lightly buffing them with some very smooth emery paper, this stopped it for about a day and then they started again. Any hints or clues to probable cause.<br>Many thanks again,<br>Chris. <p></p><i></i>

[dragracer1951]

Here's why brakes squeal...<br>the discs have grooves in them from wear...and the pads have coresponding ridges...as the two come together the pad viberates as the grooves and ridges line up...<br>Jim <p></p><i></i>

[Marcelo]

<br>Hey, have you installed the pads with their corresponding shims? It's often said that those metal pieces are meant to absorbe hi-freq vibrations that cause the screeching noise. <p>'97 Blue/Black Ace<br>'98 Gold/Black TDM</p><i></i>

[RUChris]

I forgot to mention I have R1 calipers fitted. There were no shims in them when I replaced the original pads, so I assumed this was standard R1 stuff. The pads I replaced were quite worn and the discs, although not badly scored, have definitely seen some use. I think I might have to get some newer discs, but being a skinflint, was trying to keep the cost down. Maybe some more miles on the new pads will see a noise reduction. They are not fully bedded in yet, some brake manufacturers quote up to 400 or 500 miles before fully bedded in. I have only done about 100 yet.<br>Cheers for your replies,<br>Chris. <p></p><i></i>