brake snatching problem with 99 supra any ideas? PLEASE HELP

I have a 99 supra turbo, had it in for a 6000 mile sevice and when i picked up up it drove fine of course until when i went to brake at say always a low speed about 5-10 mph the cars brakes seem to judder like abs had come on, it sounds electronics to me as the brakes work perfect at all other speeds, i took the car back to the garage and they said that all jap cars recalibrate at lows speeds like this and that was what it is? am i being a thick, or are they telling me bullshit, anybody out there know what im going on about please help its bugging the hell out of me, as im sure it didnt do it before it went in for the service.

PLEASE HELP

The brake snatching on the 99 supra i have , is the abs brake sensor got some dirt in it, and that was the result a snatching at low speed local toyota delaer checked it for me so for all you supra owners this is a common fault that someone out there must have had but anyway there you go.:flipa: :smoker2: