When I press the brake pedal it goes straight to the floor but regains position when I've took my foot off. Have spoke to a friend about this and he mentioned that it may need bleeding as the reservoir was almost empty and there doesn't seem to be any loss of fluid on the driveway.

Could anyone help as not sure as to what to purchase to remedy this. Also need to know if the parts would differ because it's an auto. Have already topped up with brake fluid so its not that, the advice was knackered brake servo unit and master cylinder could anyone advise, thanks

Newbie to the site and bit of a novice to repair work.I drive a 300 tdi disco automatic, could anyone tell me what I would need to purchase regarding the brake servo unit and master cylinder, not sure if there is any difference between an auto and a manual could anyone help,thanks.