Mine is a 300tdi 110, disks all round. Its diabolical. I may as well be rubbing chickens against the disks instead of break pads. Am doing disks, flexis/calipers all round to see if that makes a difference. Checked out the Master cylinder it seems ok. I have to pump (the brakes...) twice before any deceleration happens. It to has an MOT - No idea how! Have driven other landies and none have been great, but there again, none have been this bad!
Whoever designed those securing bolts on the calipers should be taken out, beaten with a brick then shot for good measure. I spent all of sunday taking them out, each one was pre-rounded for my pleasure.
I share your pain!