I put new pads in my 1994 850 GLE last week (not OEM sorry!) and cleaned up the calipers beforehand and made sure to replace the thin metal anti-squeal shims in all the pads. I even used a smear of copper grease on the back of the pads.

Now I have no squeals at all going forward, but as I'm backing out of my sloping drive in reverse with the brakes gently applied it squeals a lot. As soon as I drive forward its fine, and quiet when I brake in forward motion.

I noticed the new pads had what looked like a very thin black high density foam bonded to the outside of the pad. Is this to replace the metal shims? Looked like it was there to stop the pad vibrating.

Anyone any ideas?

Cheers

Steve

 

I've had mine apart twice for it. With new pads it seems to go away once they break in but it can take weeks.

I cleaned and lubed everything the first time but tore them back down as the screech was miserable. As were the stares from people around me.

You want to make sure there is a slight chamfer or angle on the forward and trailing edge of the pads. If the edges of the pads are 90 degrees to the surface of the rotor it can cause the problem. So will any worn hardware. A light pass on a grinder or even a file can break that corner down pretty easy.

 

may not be related, but my 06 scion xb does the exact same thing. squeal isnt super loud, but it is only when backing out of my slopped driveway.
Weird, right?

I had a 1990 740 which I had a shop put new pads on the rear. They were no OEM and they squealed all the time. I sold the car to an older guy. He took it to the shop that did the work, and then to another shop. None of them could get it to stop making that sound. 6 months later, he sold the car back to me...LOL. Couldnt deal with the sound!
Less, when it comes to break pads, OEM and make sure the installer knows what he is doing.