"John" <sus...@aapt.net.au> wrote in message
news:hctvm1$fbb$1...@news-01.bur.connect.com.au...
If they've eliminated defective rotors & pads, you're back to the normal
cause of brake squeal - the pads are vibrating. There is supposed to be a
light coating of a special grease between the pads & shims & most Nissans
also have a set of springs (they look kind of like hairpins) on the outside
edges of the pads to hold them back. If all that is in place, there should
be no squeal. Just because a number of different shops have looked at it,
it is not a given that any of them verified that all the parts & grease that
are supposed to be there in fact are there.
I had a VW some years ago with this same problem (and the dealer was not
able to fix it). The cheap fix was an aerosol can of a sticky goop called
"brake quiet". You spray it on the back of the pads & if there are shims,
in between the shims & on the back of the shims. The noise went away after
that.
If all "correct" fixes fail & if you can find such a thing in the local car
parts store, give it a try on the front brakes. I wouldn't use it on the
rears for fear it would defeat the adjusting mechanism (rear brakes are have
different mechanisms to accommodate the parking brake).