ABS, Parking brake and brake lights come on with a loud alert. on 2005 Audi A6 Quattro

The car runs fine.
The alert sounds every few minutes. It started intermittently, now it is nearly constant. The dealer says it is a module that controls these items and it needs to be replaced.
The cost to replace is 2,200.00 plus tax. I could replace the 4 low profile tires and wheels for less.
Are there any options and is the estimate fair?

Asked by for the 2005 Audi A6 Quattro