YRV Turbo Needs Reluctor Ring

Forum: 

My Lil YRV turbo just covered 40000 miles, replaced the discs and pads and now
Noise occurs when braking at slow speeds
Pedal fluctuation (like brake judder)
I have had this problem before on an old Rover but have found no nifo of this happening on the YRV nor can i find the replacement part
any help would be great
cheers
Roy