As mk3anni has said its not going to be the brake pad warning light as that is a different one to the ABS light. Will hopefully just be a sensor playing up, check the wiring and contacts for the one playing up (found through diagnostics like VAG-COM) and maybe give the contacts a clean. Ive had ABS problems on my VR since ive had it (nearly 4 years) and im starting to think its probably the ABS pump at fault now as the sensor has been replaced already but its only interrmitant so luckily never seems to be on for the MOT ;-)