Rear disc brake chatter/squall

[Suburban_Tyler]

Originally Posted by cadillac_al

I think you have a caliper sticking. You shouldn't be hearing any brake noise at 40 mph. How old are these calipers? I have rear discs on a couple of my Caddys and I never ever use the E brake. I have always had very good brakes with no noises. I have had to replace my calipers twice in 15 years because the E brake adjustment gets frozen up from non use and I'm too lazy (or in a hurry) to take them apart and fix them. If there were noises associated with not using the E brake I would have heard them by now. I think you just have a sticking/defective caliper.

I am trying to use the E brake more often now since that's the way they designed it. Thankfully Caddys have automatic E brake release so it isn't that much of a hassle.

The calipers were new rebuilt with the conversion kit. They don't seem like they are sticking when I've taken them off before, but I have removed them since I've hooked the cables up.

Originally Posted by craig113

Run to the shop and get the high temp silicone, put a bead on the caliper cup where the brake pad back meets it. The sound that you are hearing is the harmonics of the cup. Its like a wet finger on the crystal glass, makes a tone. The silicone will act as a vibration dampener.

I will give it a try The duralast cmax pads have a small rubber insulator on the back of the back. Trying this is worth a try though. Can't hurt to try.