They used really high-quality brake pads. Those tend to squeal quite often, but there are things we can do to minimize that. The main thing is to lightly bevel the leading edges of the linings. I've found it is sufficient to just drag them across the floor a little. I used to use a flat file, but even that isn't necessary. If the squeal can be reduced during the break-in period, they usually will not squeal later.
The second thing is the flat file should be dragged across the piston and the caliper's fingers where the pads' backing plates make contact. Those parts don't have to be shined up. They just need to be sure no dirt or debris is preventing the pads from sitting squarely on them. It is also necessary to use special high-temperature brake grease on all of those contact points. The pads are going to vibrate, and there's nothing you can do about that. The grease makes it easier for the pads to vibrate without transmitting that noise to the calipers where it would be amplified.
Mar 31, 2021 at 10:07 AM
