Hey guys!!

Right, Ive got an 52 A4 1.9 TDI, and on-board computer is saying there is an ABS fault. Now when i had the rear wheels off i noticed that the rear brake pads and MAJORLY LOW!!!hardly anything left on them. I have the spare pads here, but do you peeps think that that could be the reason that its chucking up the fault?? or do you think its worth looking into the fault more before changing the pads, its it possible that this is the problem????? thanks for any replies