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First thing to do is jack each wheel up and turn it by hand with wheel still on to see if you can find the source, an assistant to lightly apply the brakes as you do this would be helpful.
Are the front discs in good wear condition with no excessive ridge, if so check them for warping, preferably by dial gauge, but simply turning them gently with pads in normal position should show if this is the cause...if the discs have been renewed previously the faces might not have been cleaned up properly and are not sitting true.
Are all caliper pistons free, have you pumped them out a bit one at a time and pushed them back to see, if single piston front calipers are the sliders and locating pins if sliders clean and free to move without sticking, you haven't got a pad retaining pin sticking out and touching the disc under braking, or a wear indicator sticking out too much?.
Sounds like you have rear drums, are the shoes in good nick, are the drums good too, again turn them gently if necessary pulling the handbrake up one click at a time to see if you have any high spots, do the self adjusters work correctly.
Assuming you find the cause of the grinding sound, and i would suspect front discs worn for this, if it doesn't disappear the juddering might not be from the brakes, could be a worn CV joint, inner ot outer, bent drive shaft etc.
One other thing, whilst you have the pads pushed back or the rear shoes well home slip each wheel back on spin it up freely and check for wheel bearing noise.
Thats all i can think of at the moment assuming the good suggestions above bear no fruit.
Edited by gordonbennet on 11/12/2011 at 00:46
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