99 Audi A6 - ABS light and Brake light blinking with 3 beeps?

[buying car]

My 99 Audi A6 has the abs light on not all the time. Sometimes, I can go on for 20 mile and nothing but all of a sudden the lights and beep come on.

I read that it may be the ABS module which I think I can replace myself but then others say it could be the brake sensor. My brake pads have some 25K miles on them.

If you have experience these symtoms and get the issue figured out, please let me/us know so that we can leverage you knowedge and avoid the dealer big invoices :-)

[daddyporky@verizon.net]

open the hood take the cap off the brake master cylinder.. if the liquid is half way down... this means brake pads need to be replaced. they are worn more than half way.. do this yourself.. total for pads sixty dollars buy the metallics.. ok

[deebelfast]

i got my breaks changed and they broke the sensor now my light stays on all the time
maybe your is loose