Well, yes, I know all mk2 brakes are a little unnerving

Problem is, mine are fine under anything up to moderate braking, and then the rear wheels just lock up. Apart from being somewhat dangerous, it's really embarrassing to come sliding to a stop just to give someone else right of way to pass a parked car

I don't notice any problems at all under normal braking, and the brakes are plenty strong enough to lock all of the wheels if I need to (albeit with my full weight behind the brake pedal..).. brake discs and pads are a bit worn, but not worryingly so, and all of the tyres have plenty of tread left on them.. so I'm not quite sure what's up with it..
Always possible that through some incredible coincidence my rear wheels just happen to have been on a loose surface every time I've braked heavily, I suppose.. but I think it's more likely to be the car.
Thanks a lot for any suggestions you may have..