please help. ldv brake fail?

Desperate for help!!!
I have a LDV 400 convoy BI-fuel. I bought the truck from Devon and while driving back to somerset one of the nearside brake pads came out resulting in brake fail.
I got it home via motorway using the handbrake and put new pads in bother sides. Now the situation is that I have very little braking.
I've changed the servo and still long travel on the pedal with braking at the final moment.
I've bleed it the conventional way so many times to which HAS giving me a little more braking but still long travel. If I slam the brakes on, the front will lock up.
How can I get my brakes to a point where they start to work when the pedal is press to a slight level?
Please help.

Kind regards

Chris

Chris Barr
October 2015