What up guys! hey i was driving home last night and my abs light and park brake light popped on. I was near home and made it there parked and read my manuel and it said that i probly dumpped all my brake fluid and to not drive the car I looked and all the fluid was still there. i got up this morning and turned the car on and the light was off so i just took it as a error. Although i was on the high way and about 10 minutes into my drive and it came back on. It didnt seem to make a huge difference on the way to work but on my way home the car felt as if the brakes weren't catching in the front and helping slow the car down. could it just be the sensor on the abs in the front or do I need to replace the brakes? I called advance auto to see if I could have them pull the code but they said there was no code for that? what should I do as a next step any advice guys? by the way its a 1998 Audi A6 quattro.

Thanks, Dennis