I have Ap bbk fitted front and rear. The shudder is from the front and shakes the steering it's not as bad when I brake lightly but is really bad when I brake harder basically it's taking the enjoyment out of driving the car. I had the calipers off the car and checked them over . All the pistons seem to be moving freely. The wheels where all refurbished recently so I can rule out any buckles in the wheels. The last pads I had fitted Aps own were so dusty the inside pads actually we're jamming in the calipers I thought that might be the cause so binned those pads and fitted new ones skimmed the discs but to no avail I've still got the same problem.
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