Every morning the same story, everything is fine but after driving for awhile the ABS lights on and Brake light flashes.
is my sensor or the Module Bad!

 

possibly the module but check the pads and the fluid level

 

fluid level is good... pads seem ok... how about the sensor?

 

its the module. ALL Audi a6 modules are defective in which a resistor comes loose and connection to the car computer fails bringing up the light. The module can be rebuilt though, Bosch seriously messed this one up!!![:@]

 

I have the same problem. I am very good with small electronics, can I repair it myself?

 

Just sent my 98 A6 Quattro 2.8 module to modulemaster.com. who I located on this forum The part is relatively easy to pull with the instructions on the website. Some repair shops will suggest you replace the pump, which I understand is almost neverbad, along with the module which in fact has a high failure rate. My quote was for about $2400 for the whole deal or $1000 for the module alone and about $250 in labor. I pulled the module myself which took about an hour and will pay Module Master $200 to have it repaired. I'll be real surprised if the pump is also bad and this doesn't fix things.I'm looking forward to a clean and quiet (no lights, no bells) instrument panel and, oh yeah, saving a $1000 bill.