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I had a similar problem years ago on a new car after its first service. The problem was front wheel judder when braking. Different front pads were fitted and front discs were checked. Did not help. Softer front pads made no difference either. I traced the fault myself to oval rear brake drums caused by overadjusted handbrake at the first service. The excess heat caused by the rubbing shoe had distorted the drums. The shape of the drums then sent hydraulic pulses to the front brakes which were the more efficient disc brakes making everybody believe it was a front brake problem. I wonder if the same thing is happening here, ie a fault on the rear discs is being transmitted to the more efficient front brakes along the hydraulic lines.
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