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Yes,it's common.Once the brakes are warmed up,use your front brake hard a few times,and see if it goes away for a while.If not,you'll need to yank the pads,and break the glaze on the face with some emery cloth,or sandpaper.Then get some "disc brake quiet" from the auto parts store,and use it as recommended.It works.Please note that this stuff goes on the back of the pad,not the braking surface! Doing this will most likely get rid of your noise.
This is probably exactly the procedure your dealer will perform if you take it in complaining about brake squeal.Most likely though,they will just tell you to go away-They all do that-It's perfectly normal.And it is,but you can fix it by doing what I said.
Doing just one or the other may not fix it,so do them both.
Brake squeal is caused by a combination of two things.Glazed over pads,and high frequency vibration between the pads,and the caliper/pistons.Glazed pads exacerbate the high frequency vibration,but they can make a squeal of their own,sort of like the sound you can make by running your fingertips down a pane of glass.The disc brake quiet works by taking up space between the pads and calipers,and cushioning,and damping out the vibration.
Inexpensive pads,like the ones fitted new on most bikes,have a tendency to glaze,because the chemicals that bond together the pad media will clump together,if they are heated to high temperatures early in their working life.After a few heat/cool cycles,they stabilize,but by then the damage is done.That's why we go through a pad break in procedure before we release our customers vehicles to them,since most of them insist on buying cheap-ass pads.If we don't,we'll have noise come-backs for sure. Better quality pads have more heat resistant chemical compounds,in addition to higher friction coefficients. Hence their higher price.
Hope this helps.
Cheers!
Bruce
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