Ok I'm new on here, that new that I can't work out how to post my own thread, but I'm looking for a bit of advise

Got a Transit Connect Tdci 06 Lwb hight top, and have a problems with the brakes...any help really appreciate.

The history
Been hammering the van now for 1000mile a week for the last 9months, I noticed that when braking, I could feel the abs pumping throughout the brake pedal, as I didn't have time to get it checked, I just carried on.. And then like a dickhead and I hit a kerb and broke a gear box mount and fucked the near side drive shaft..
Had this fixed and everything was rosey for about 2 week, then the brake pedal becomes pretty shit, I press the pedal and it goes straights to the floor I lift my foot off and press again and I have brakes, I've also notice that if I pump the pedal before starting it and it goes hard, that when I start the van with my foot on the pedal the pedal slowly presses down ??? Sometimes it also feels like the brakes are really loose on the discs and are just catching?
Also noticed that when the steering wheel is to the right there's a whining?
Guy at kwick fit reckons its the servo, not had chance to get it checked by a real garage yet, but was also thinking maybe since the mount had broke, maybe some of the bushes have worn down?.
Any help would be really appreciated, before I start spending