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Really loud brake noise

Hello again....

So, this is the third possible costly issue that is going on with the car right now. Already posted about the rattle, the surging revs and now there is this....

There is a very, very loud grinding noise coming from the drivers side front brake when slowing from reasonable speeds, usually worse when the brakes have been progressively used instead of using them hard and for a short time. Hard to describe, but I notice it mainly when coming down from motorway or A road speeds down slip roads to junctions, when I want to gently slow down to the stop point.....the noise isn't there initially, but the longer I have my foot gently on the brake, the louder and louder the noise gets until it sounds like the brake or hub is going to fall off! Its horrendous! There is a slight vibration through the pedal too, yet braking efficiency is still fine, it pulls up in a straight line and there is no other issue as far as can be seen. I have had it looked at by a friend of mine with a mechanics business and he said he couldn't find or see anything wrong with it apart from a bit of corrosion around the center hub of the disc. Pad wear seems fine, doesn't seem to be any warping......but jeepers its loud!

Anyone got any ideas on this? I can see all of these things combined being very!!!
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Sounds like a sticking brake calliper to me.
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Are the discs lipped?
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brake , brakes , grind or vibration , loud , noise

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