I have changed the master cylinder and front hoses and it still won't go hard. I have tried clamping the rear hose and the brakes seem to go alot better but as soon as clamp is released goes to the same I have changed both rear cylinders and copper pipes but still get air coming out the rear wheels.
Wen I drove from the farm the brakes where amazing solid all the time but wen I stop at the lights the pedal goes down about half way but if you pump it it goes solid and wen you drive again it is solid no movement and stops so much better.
If you sit with foot on pedal it will go down a bit